CompTIA Linux+ XK005 (171Q).

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Questão 1 de 171

A systems administrator pressed Ctrl+Z after starting a program using the command line, and the shell prompt was presented.
In order to go back to the program, which of the following commands can the administrator use?

Selecione uma das seguintes:

Explicação

Questão 2 de 171

A Linux administrator is alerted to a storage capacity issue on a server without a specific mount point or directory.
Which of the following commands would be MOST helpful for troubleshooting? (Choose two).

Selecione uma ou mais das seguintes:

parted
df
mount
du
fdisk
dd
ls

Explicação

Questão 3 de 171

A Linux administrator needs to resolve a service that has failed to start. The administrator runs the following command:

ls -l startup file

The following output is retorned

---------. root root 81k Sep 13 19:01 startupfile

Which of the following is MOST likely the issue?

Selecione uma das seguintes:

The service does not have permissions to read write the startupfile.
The service startupfile size cannot be 81k.
The service startupfile cannot be owned by root.
The service startupfile should not be owned by the root group.

Explicação

Questão 4 de 171

Users report that connections to a MariaDB service are being closed unexpectedly. A systems administrator troubleshoots the issue and finds the following message in /var/log/messages.

dbserver kernel: out of Memory: Killed process 1234 (mysqld) .

Which of the following is causing the connection issue?

Selecione uma das seguintes:

The process mysqld is using too many semaphores.
The server is running out of file descriptors.
Something is starving the server resources.
The amount of RAM allocated to the server is too high.

Explicação

Questão 5 de 171

A cloud engineer needs to launch a container named web-01 in background mode.
Which of the following commands will accomplish this task?

Selecione uma das seguintes:

docker builder -f --name web-01 httpd
docker load --name web-01 httpd
docker ps -a --name web-01 httpd
docker run -d --name web-01 httpd

Explicação

Questão 6 de 171

A Linux administrator is tasked with adding users to the system. However, the administrator wants to ensure ther users access will be disebled once the project is over.
The expiration date should be 2021-09-30.
Which of the following commands will accomplish this task?

Selecione uma das seguintes:

sudo useradd -e 2021-09-30 Project_user
sudo useradd -c 2021-09-30 Project_user
sudo modinfo -F 2021-09-30 Project_user
sudo useradd -m -d 2021-09-30 Project_user

Explicação

Questão 7 de 171

A systems administrator frequently connects to a remote host via SSH and a non-standard port. The system administrator would like to avoid passing the port parameter on the command line every time.
Which of the following files can be used to set a different port value for that host?

Selecione uma das seguintes:

/etc/ssh/sshd_config
/etc/ssh/moduli
~/.ssh/config
~/.ssh/authorized_keys

Explicação

Questão 8 de 171

A systems administrator installed a new software program on a Linux server. When the system administrator tries to run the program, the following message appears on the screen.

Hardware virtualization support is not available on this system.
Either is not present or disabled in the system's BIOS.

Which of the following commands will allow the system administrator to check whether the system supports virtualization?

Selecione uma das seguintes:

dmidecode -s system-version
Iscpu
sysctl-a
cat /sys/device/system/cpu/possible

Explicação

Questão 9 de 171

A Linux administrator needs to analyze a failing application that is running inside a container.
Which of the following commands allows the Linux administrator to enter the running container and analyze the logs that are stored inside?

Selecione uma das seguintes:

docker run -ti app /bin/sh
podman exec -ti app /bin/sh
podman run -d app /bin/sh
docker exec -d app /bin/bash

Explicação

Questão 10 de 171

A Linux administrator was asked to run a container with the httpd server inside. This container should be exposed at port 443 of a Linux host machine while it internally listens on port 8443.
Which of the following commands will accomplish this task?

Selecione uma das seguintes:

podman run -d -p 443:8443 httpd
podman run -d -p 8443:443 httpd
podman run -d -e 443:8443 httpd
podman exec -p 8443:443 httpd

Explicação

Questão 11 de 171

A systems administrator requires that all files that are created by the user named web have read-only permissions by the owner.
Which of the following commands will satisfy this requirement?

Selecione uma das seguintes:

chown web:web /home/web
chmod -R 400 /home/web
echo "umask 377" >> /home/web/.bashrc
setfacl read /home/web

Explicação

Questão 12 de 171

A Linux administrator has installed a web server, a database server, and a web application on a server. The web application should be active in order to render the web pages. After the administrator restarts the server, the website displays the following message in the browser. Error establishing a database connection. The Linux administrator reviews the following relevant output from the systemd init files:

[image]

The administrator needs to ensure that the database is available before the web application is started. Which of the following should the administrator add to the HTTP server .service file to accomplish this task?

Selecione uma das seguintes:

TRIGGERS=mariadb.service
ONFAILURE=mariadb.service
WANTEDBY=mariadb.service
REQUIRES=mariadb.service

Explicação

Questão 13 de 171

A systems administrator is notified that the mysqld process stopped unexpectedly.

The systems administrator issues the following command:
sudo grep -i -r 'out of memory' /var/log

The output of the command shows the following:
kernel: Out of memory: Kill process 9112 (mysqld) score 511 or sacrifice child.

Which of the following commands should the systems administrator execute NEXT to troubleshoot this issue? (Select two).

Selecione uma ou mais das seguintes:

free -h
nc -v 127.0.0.1 3306
renice -15 $(pidof mysql)
lsblk
killall -15
vmstat -a 1 4

Explicação

Questão 14 de 171

An administrator transferred a key for SSH authentication to a home directory on a remote server. The key file was moved to .ssh/authorized_keys location in order to establish SSH connection without password. However, the SSH command still asked for the password. Given the following ouput;

[image]

Which of the following commands would resolve the issue?

Selecione uma das seguintes:

restorecon .ssh/authorized_keys
ssh_keygen -t rsa -o .ssh/authorized_keys
chown root:root .ssh/authorized keys
chmod 600 .ssh/authorized_keys

Explicação

Questão 15 de 171

A Linux administrator is providing a new Nginx image from the registry to local cache. Which of the following commands would allow this to happen?

Selecione uma das seguintes:

docker pull nginx
docker attach ngninx
docker commit nginx
docker import nginx

Explicação

Questão 16 de 171

A new Linux systems administrator just generated a pair of SSH keys that should allow connection to the servers. Which of the following commands can be used to copy a key file to remote servers? (Choose two).

Selecione uma ou mais das seguintes:

wget
ssh-keygen
ssh-keyscan
ssh-copy-id
ftpd
scp

Explicação

Questão 17 de 171

A Linux engineer is setting the sticky bit on a directory called devops with 755 file permission. Which of the following commands will accomplish this task?

Selecione uma das seguintes:

chown -s 755 devops
chown 1755 devops
chmod -s 755 devops
chmod 1755 devops

Explicação

Questão 18 de 171

An administrator accidentally deleted the /boot/vmlinuz file and must resolve the issue before the server is rebooted. Which of the following commands should the administrator use to identify the correct version of this file?

Selecione uma das seguintes:

rpm -qa | grep kernel, uname -a
yun -y update; shutdown -r now
cat /etc/centos-release; rpm -Uvh --nodeps
telinit 1; restorecon -Rv /boot

Explicação

Questão 19 de 171

A Linux administrator was notified that a virtual server has an I/O bottleneck. The Linux administrator analyzes the following ouput:

[image]

Given there is a single CPU in the server, which of the following is causing the slowness?

Selecione uma das seguintes:

The system is running out of swap space.
The CPU is overloaded.
The memory is exhausted.
The processes are paging.

Explicação

Questão 20 de 171

A Linux administrator wants to set the SUID of a file named dev_team.text with 744 access rights. Which of the following commands will achieve this goal?

Selecione uma das seguintes:

chmod 4744 dev_team.txt
chmod 744 --seduid dev_team.txt
chmod -c 744 dev_team.txt
chmod -v 4744 --suid dev_team.txt

Explicação

Questão 21 de 171

Which of the following commands will display the operating system?

Selecione uma das seguintes:

uname -n
uname -s
uname -o
uname -m

Explicação

Questão 22 de 171

A system administrator is tasked with installing GRUB on the legacy MBR of the SATA hard drive. Which of the following commands will help the administrator accomplish this task?

Selecione uma das seguintes:

grub-install /dev/hda
grub-install /dev/sda
grub-install /dev/sr0
grub-install /dev/hd0,0

Explicação

Questão 23 de 171

A systems administrator wants to test the route between IP address 10.0.2.15 and IP address 192.168.1.40. Which of the following commands will accomplish this task?

Selecione uma das seguintes:

route -e get to 192.168.1.40 from 10.0.2.15
ip route get 192.163.1.40 from 10.0.2.15
ip route 192.169.1.40 to 10.0.2.15
route -n 192.168.1.40 from 10.0.2.15

Explicação

Questão 24 de 171

A Linux administrator is tasked with creating resources using containerization. When deciding how to create this type of deployment, the administrator identifies some key features, including portability, high availability and scalability in production. Which of the following should the Linux administrator choose for the new design?

Selecione uma das seguintes:

Docker
On-premises systems
Cloud-based systems
Kubernetes

Explicação

Questão 25 de 171

A systems administrator made some unapproved changes prior to leaving the company. The newly hired administrator has been tasked whit revealing the system to a compliant state. Which of the following commands will list and remove the correspondent packages?

Selecione uma das seguintes:

dnf list and dnf remove last
dnf remove and dnf check
dnf info and dnf upgrade
dnf history and dnf history undo last

Explicação

Questão 26 de 171

Which of the following enables administrators to configure and enforce MFA on a Linux system?

Selecione uma das seguintes:

Kerberos
SELinux
PAM
PKI

Explicação

Questão 27 de 171

A cloud engineer needs to check the link status of a network interface named eth1 in a Linux server. Which of the following commands can help to achieve the goal?

Selecione uma das seguintes:

ifconfig hw eth1
netstat -r eth1
ss -ti eth1
ip link show eth1

Explicação

Questão 28 de 171

A Linux administrator has been tasked with installing the most recent versions of packages on a RPM-based OS. Which of the following commands will accomplish this task?

Selecione uma das seguintes:

apt-get upgrade
rpm -a
yum updateinfo
dnf update
yum check-update

Explicação

Questão 29 de 171

A systems administrator is tasked with mounting a USB drive on a system. The USB drive has a single partition, and it has been mapped by the system to the device /dev/sdb. Which of the following commands will mount the USB to /media/usb?

Selecione uma das seguintes:

mount /dev/sdb1 /media/usb
mount /dev/sdb0 /media/usb
mount /dev/sdb /media/usb
mount -t usb /dev/sdb1 /media/usb

Explicação

Questão 30 de 171

A Linux administrator created a new file system. Which of the following files must be updated to ensure the filesystem mounts at boot time?

Selecione uma das seguintes:

/etc/sysctl
/etc/filesystems
/etc/fstab
/etc/nfsmount.conf

Explicação

Questão 31 de 171

A system administrator is troubleshooting connectivity issues and trying to find out why a Linux server is not able to reach other servers on the same subnet it is connected to. When listing link parameters, the following is presented:

[image]

Based on the output above, which of following is the MOST probable cause of the issue?

Selecione uma das seguintes:

The address ac:00:11:22:33:cd is not a valid Ethernet address.
The Ethernet broadcast address should be ac:00:11:22:33:ff instead.
The network interface eth0 is using an old kernel module.
The network interface cable is not connected to a switch.

Explicação

Questão 32 de 171

A system administrator wants to be sure the sudo rules just added to /etc/sudoers are valid. Which of the following commands can be used for this task?

Selecione uma das seguintes:

visudo -c
test -f /etc/sudoers
sudo vi check
cat /etc/sudoers | tee test

Explicação

Questão 33 de 171

A systems administrator is tasked with setting up key-based SSH authentication. In which of the following locations should the administrator place the public keys for the server?

Selecione uma das seguintes:

~/.ssh/authkeys
~/.ssh/keys
~/.ssh/authorized_keys
~/.ssh/keyauth

Explicação

Questão 34 de 171

A systems administrator has been unable to terminate a process. Which of the following should the administrator use to forcibly stop the process?

Selecione uma das seguintes:

kill -1
kill -3
kill -15
kill -HUP
kill -TERM

Explicação

Questão 35 de 171

A junior Linux administrator is tasked with installing an application. The installation guide states the application should only be installed in a run level 5 environment.

$systemctl get-default
getty.target

Which of the following commands would ensure the server is set to run level 5?

Selecione uma das seguintes:

systemctl isolate multi-user.target
systemctl isolate graphical.target
systemctl isolate network.target
systectl isolate basic.target

Explicação

Questão 36 de 171

When trying to log in remotely to a server, a user receives the following message:

[image]

Which of the following is causing the issue?

Selecione uma das seguintes:

The wrong permissions are on the user's home directory.
The account was locked out due to three failed logins.
The user entered the wrong password.
The user has the wrong shell assigned to the account.

Explicação

Questão 37 de 171

Which of the following technologies provides load balancing, encryption, and obsiervability in containerized enviroments?

Selecione uma das seguintes:

Virtual private network
Sidecar pod
Overlay network
Service mesh

Explicação

Questão 38 de 171

At what point is the Internal Certificate Authority (ICA) created?

Selecione uma das seguintes:

During the primary Security Management Server installation process.
Upon creation of a certificate.
When an administrator decides to create one.
When an administrator initially logs into SmartConsole.

Explicação

Questão 39 de 171

A could engineer need to remove all dangling images and delete all the images that do not have and associated container. Which of the following commands will help to accomplish this task?

Selecione uma das seguintes:

docker images prune -a
docker push images -a
docker rmi -a images
docker images rmi --all

Explicação

Questão 40 de 171

A systems administrator is tasked with creating a cloud-based server with a public IP address.

The code is as follows:

[img]

Which of the following technologies did the systems administrator use to complete this task?

Selecione uma das seguintes:

Puppet
Git
Ansible
Terraform

Explicação

Questão 41 de 171

Employees in the finance department are having trouble accessing the file /opt/work/file. All IT employees can read and write the file. Systems administrator reviews the following output:

[img]

Which of the following commands would permanently fix the access issue while limiting access to IT and finance department employees?

Selecione uma das seguintes:

chattr +i file
chown it:finance file
chmod 666 file
setfacl -m g:finance:rw file

Explicação

Questão 42 de 171

A Linux administrator is reviewing changes to a configuration file that includes the following section:

[img]

The linux administrator is trying to select the appropiate syntax formatter to correct any issues with the configuration file. Which of the following should the syntax formatter support to meet this goal?

Selecione uma das seguintes:

Markdown
XML
YAML
JSON

Explicação

Questão 43 de 171

A Linux administrator is scheduling a system job that runs a script to check available disk space every hour. The Linux administrator does not want users to be able to start the job. Given the following:

[img]

Selecione uma das seguintes:

The checkdiskspace.timer unit should be enabled via systemctl.
The timers.target should be reloaded to get the new configuration.
The checkdiskspace.timer should be configured to allow manual starts.
The checkdiskspace.timer should be started using the sudo command.

Explicação

Questão 44 de 171

One leg of an LVM-mirrored volume failed due the underlying physical volume, and a systems administrator is troubleshooting the issue. The following ouput has been provided:

[img]

Selecione uma das seguintes:

Reboot the srever. The volume will automatically go back to linear mode.
Replace the failed drive and reconfigure the mirror.
Reboot the server. The volume will revert to stripe mode.
Recreate the logical volume.

Explicação

Questão 45 de 171

A Linux administrator recently downloaded a software package that is currently in a compressed file. Which of the following commands will extract the files?

Selecione uma das seguintes:

unzip -v
bzip2 -z
gzip
funzip

Explicação

Questão 46 de 171

A developer reported an incident involving the application configuration file /etc/httpd/conf/httpd.conf that is missing from the server. Which of the following identifies the RPM package that installed the configuration file?

Selecione uma das seguintes:

rpm -qf /etc/httpd/conf/httpd.conf
rpm -ql /etc/httpd/conf/httpd.conf
rpm --query /etc/httpd/conf/httpd.conf
rpm -q /etc/httpd/conf/httpd.conf

Explicação

Questão 47 de 171

A cloud engineer is installing packages during VM provisioning. Which of the following should the engineer use to accomplish this task?

Selecione uma das seguintes:

Cloud-init
Bash
Docker
Sidecar

Explicação

Questão 48 de 171

A user generated a pair of private-public keys on a workstation. Which of the following commands will allow the user to upload the public key to a remote server and enable passwordless login?

Selecione uma das seguintes:

scp ~/.ssh/id_rsa user@server:~/
rsync ~/.ssh/ user@server:~/
ssh-add user server
ssh-copy-id user@server

Explicação

Questão 49 de 171

A Linux administrator needs to ensure that Java 7 and Java 8 are both locally available for developers to use when deploying containers. Currently only Java 8 is available. Which of the following commands should the administrator run to ensure both versions are available?

Selecione uma das seguintes:

docker image load java: 7
docker image pull java:7
docker image import java:7
docker image build java:7

Explicação

Questão 50 de 171

A Linux administrator is troubleshooting SSH connection issues from one of the workstations.
When users attempt to log in from the workstation to a server with the IP address 104.21.75.76, they receive the following message:

ssh: connect to host 104.21.75.76 port 22: Connection refused.

The administrator reviews the information bellow:

[img]

Selecione uma das seguintes:

The workstation has the wrong IP settings.
The sshd service is disabled.
The server's firewall is preventing connections from being made.
The server has an incorrect default gateway configuration.

Explicação

Questão 51 de 171

A database administrator requested the installation of a custom database on one of the server. Which of the following should the Linux administrator configure so the requested packages can be installed?

Selecione uma das seguintes:

/etc/yum.conf
/etc/ssh/sshd.conf
/etc/yum.repos.d/db.repo
/etc/resolv.conf

Explicação

Questão 52 de 171

A Linux administrator has set up a new DNS forwarder and is configuring all internal servers to use the new forwarder to look up external DNS requests. The administrator needs to modify the firewall on the server for the DNS forwarder to allow the internal servers to communicate to it and make the changes persistent between server reboots. Which of the following commands should be run on the DNS forwarder server to accomplish this task?

Selecione uma das seguintes:

ufw allow out dns
systemctl reload firewalld
iptables -A OUTPUT -p udp -m udp-dport 53 -j ACCEPT
firewall-cmd --zone=public --add-port=53/udp --permanent

Explicação

Questão 53 de 171

A Linux administrator modified the SSH configuration file. Which of the following commands should be used to apply the configuration changes?

Selecione uma das seguintes:

systemctl stop sshd
systemctl mask sshd
systemctl reload sshd
systemctl start sshd

Explicação

Questão 54 de 171

A Linux administrator needs to create a new cloud.cpio archive containing all the files from the currently directory. Which of the following commands can help to accomplish this task?

Selecione uma das seguintes:

ls | cpio -iv > cloud.epio
ls | cpio -iv < cloud.epio
ls | cpio -ov > cloud.cpio
ls cpio -ov < cloud.cpio

Explicação

Questão 55 de 171

A Linux administrator is creating a primary partition on the replacement hard drive for an application server. Which of the following commands should the administrator issue to verify the device name of this partition?

Selecione uma das seguintes:

sudo fdisk /dev/sda
sudo fdisk -s /dev/sda
sudo fdisk -l
sudo fdisk -h

Explicação

Questão 56 de 171

Users have reported that the interactive sessions were lost on a Linux server. A Linux administrator verifies the server was switched to rescue .target mode for maintenance. Which of the following commands will restore the server to its usual target?

Selecione uma das seguintes:

telinit 0
systemctl reboot
systenctl get-default
systemctl emergency

Explicação

Questão 57 de 171

A Linux systems administrator is configuring a new filesystem that needs the capability to be mounted persistently across reboots. Which of the following commands will accomplish this task (Choose two).

Selecione uma ou mais das seguintes:

df -h /data
mkfs.ext4 /dev/sdc1
fsck /dev/sdc1
fdisk -l /dev/sdc1
echo "/data/dev/sdc1 ext4 defaults 0 0" >> /etc/fstab
echo "/dev/sdc1 /data ext4 defaults 0 0" >> /etc/fstab

Explicação

Questão 58 de 171

Which of the following tools is BEST suited to orchestrate a large number of containers across many different servers?

Selecione uma das seguintes:

Kubernetes
Ansible
Podman
Terraform

Explicação

Questão 59 de 171

A Linux engineer receives reports that files created within certain group are being modified by users who are not group members. The engineer wants to reconfigure the server so that only file owners and group members can modify new files by default. Which of the following commands would accomplish this task?

Selecione uma das seguintes:

chmod 775
umask 002
chattr -Rv
chown -cf

Explicação

Questão 60 de 171

An administrator attempts to rename a file on a server but receives the following error.

mv: cannot move 'files/readme.txt' to 'files/readme.txt.orig': Operation not permitted.

The administrator then runs a few commands and obtains the following output:

[img]

Which of the following commands should the administrator run NEXT to allow the file to be renamed by any user?

Selecione uma das seguintes:

chgrp reet files
chacl -R 644 files
chown users files
chmod -t files

Explicação

Questão 61 de 171

A Linux administrator would like to use the systemd to schedule a job to run every two hours. The administrator creates timer and services definition and restarts the server to load these new configurations. After the restart, the administrator checks the log file and notices that the job is only running daily. Which of the following is MOST likely causing the issue?

Selecione uma das seguintes:

The checkdiskspace.service is not running.
The checkdiskspace.service needs to be enabled.
The OnCalendar schedule is incorrect in the timer definition.
The system-daemon services need to be reloaded.

Explicação

Questão 62 de 171

After listing the propierties of a system account, a systems administrator wants to remove the expiration date of a user account. Which of the following commands will accomplish this task?

Selecione uma das seguintes:

chgrp system accountname
passwd -s accountname
chmod -G system account name
change -E -1 accountname

Explicação

Questão 63 de 171

A Linux system is getting an error indicating the root filesystem is full. Which of the following commads should be used by the systems administrator to resolve this issue? (Choose three).

Selecione uma ou mais das seguintes:

df -h /
fdisk -1 /dev/sdb
growpart /dev/mapper/rootvg-rootlv
pvcreate /dev/sdb
lvresize -L +10G -r /dev/mapper/rootvg-rootlv
lsblk /dev/sda
parted -l /dev/mapper/rootvg-rootlv
vgextend /dev/rootvg /dev/sdb

Explicação

Questão 64 de 171

A Linux administrator needs to create an imagen named sda.img from the sda disk and store it in the /tmp directory. Which of the following commands should be used to accomplish this task?

Selecione uma das seguintes:

dd of=/dev/sda if=/tmp/sda.img
dd if=/dev/sda of=/tmp/sda.img
dd --if=/dev/sda --of=/tmp/sda.img
dd --of=/dev/sda --if=/tmp/sda.img

Explicação

Questão 65 de 171

A systems technician is working on deploying several microservices to various RPM-based systems, some of which could run up to two hours. Which of the following commands will allow the technician to execute those services and continue deploying other microservices within the same terminal section?

Selecione uma das seguintes:

gedit & disown
kill 9 %1
fg %1
bg %1 job name

Explicação

Questão 66 de 171

A Linux administrator is adding a new configuration file to a Git repository. Which of the following describes the correct order of Git commands to accomplish the task successfully?

Selecione uma das seguintes:

pull _> push _> add _> checkout
pull _> add _> commit _> push
checkout _> push _> add _> pull
pull _> add _> push _> commit

Explicação

Questão 67 de 171

Users have been unable to reach www.comptia.org from a Linux server. A systems administrator is troubleshooting the issue and does the following:

[img]

Based on the information above, which of the following is causing the issue?

Selecione uma das seguintes:

The name www.comptia.org does not point to a valid IP address.
The server 192.168.168.53 is unreachable.
No default route is set on the server.
The network interface eth0 is dissconected.

Explicação

Questão 68 de 171

A systems administrator needs to reconfigure a Linux server to allow persistent IPv4 packet forwarding. Which of the following commands is the correct way to accomplish this task?

Selecione uma das seguintes:

echo 1 > /proc/sys/net/ipv4/ipv_forward
sysctl -w net.ipv4.ip_forward=1
firewall-cmd --enable ipv4_forwarding
systemctl start ipv4_forwarding

Explicação

Questão 69 de 171

A Linux administrator reviews a set of log output files and needs to identify files that contain any occurrence of the word denied. All logs files containing entries in uppercase or lowercase letters should be included in the list. Which of the following commands should the administrator use to accomplish this task?

Selecione uma das seguintes:

find .-type f -print | xrags grep -In denied
find .-type f -print | xrags grep -nv denied
find .-type f -print | xrags grep -wL denied
find .-type f -print | xrags grep -li denied

Explicação

Questão 70 de 171

A Linux user reported the following error after trying to connect to the system remotely:

ssh: connect to host 10.0.1.10 port 22: Resource temporarily unavailable.

The Linux system administrator executed the following commands in the Linux system while trying to diagnose the issue:

[img]

Which of the following commands will resolve this issue?

Selecione uma das seguintes:

firewall-cmd --zone=public --permanent --add-service=22
systemctl enable firewalld; systemctl restart firewalld
firewall-cmd --zone=public --permanent -add-service=ssh
firewall-cmd --zone=public --permanent --add-port=22/udp

Explicação

Questão 71 de 171

A cloud enginner need to block the IP address 192.168.10.50 from accessing a Linux server. Which of the following commands will achieve this goal?

Selecione uma das seguintes:

iptables -F INPUT -j 192.168.10.50 -m DROP
iptables -A INPUT -s 192.168.10.30 -j DROP
iptables -i INPUT --ipv4 192.168.10.50 -z DROP
iptables -j INPUT 192.168.10.50 -p DROP

Explicação

Questão 72 de 171

A junior administrator is trying to set up a passwordless SSH connection to one of the servers. The administrator follows the instructions and puts the key in the authorized_key file at the server, but the administrator is still asked to provide a password during the connection.

Given the following output:

[img]

Which

Selecione uma das seguintes:

restorecon -rv .ssh/authorized_key
mv .ssh/authorized_key .ssh/authorized_keys
systemctl restart sshd.service
chmod 600 mv .ssh/authorized_key

Explicação

Questão 73 de 171

A systems engineer is adding a new 1GB XFS filesystem that should be temporarily mounted under /ops/app. Which of the following is the correct list of commands to achieve this goal?

Selecione uma das seguintes:

pvcreate -L1G /dev/app
mkfs.xfs /dev/app
mount /dev/app /opt/app
parted /dev/sdb --script mkpart primary xfs 1GB
mkfs.xfs /dev/sdb
mount /dev/sdb /opt/app
lvs --create 1G --name app
mkfs.xfs /dev/app
mount /dev/app /opt/app
lvcreate -L 1G -n app app_vq
mkfs.xfs /dev/app_vg/app
mount /dev/app_vg/app /opt/app

Explicação

Questão 74 de 171

An administrator installed an application from source into/opt/operations1/ and has received numerous reports that users are not able to access the application without having to use the full path /opt/operations1/bin/*. Which of the following commands should be used to resolve this issue?

Selecione uma das seguintes:

echo 'exportPATH=$PATH:/opt/operations1/bin' >> /etc/profile
echo 'exportPATH=/opt/operations1/bin' >> /etc/profile
echo 'exportPATH=$PATH/opt/operations1/bin' >> /etc/profile
echo 'export $PATH:/operations1/bin' >> /etc/profile

Explicação

Questão 75 de 171

Which of the following files holds the system configuration for journal when running systemd?

Selecione uma das seguintes:

/etc/systemd/journald.conf
/etc/systemd/systemd-journalctl.conf
/usr/lib/systemd/journalctl.conf
/etc/systemd/systemd-journald.conf

Explicação

Questão 76 de 171

A junior systems administrator has just generated public and private authentication keys for passwordless login. Which of the following files will be moved to the remote servers?

Selecione uma das seguintes:

id_dsa.pem
id_rsa
id_ecdsa
id_rsa.pub

Explicação

Questão 77 de 171

A development team asks an engineer to guarantee the persistency of journal log files across system reboots. Which of the following commands would accomplish this task?

Selecione uma das seguintes:

grep -i auto /etc/systemd/journald.conf && systemctl restart systemd-journald.service
cat /etc/systemd/journald.conf | awk '(print $1, $3)'
sed -i 's/auto/persistent/g' /etc/systemd/journald.conf && sed -i 'persistent/s/¨#//q' /etc/systemd/journald.conf
journalctl --list-boots && systemctl restart systemd-journald.service

Explicação

Questão 78 de 171

A systems administrator is investigating why one of the servers has stopped connecting to the internet.

[img]

Which of the following is causing the issue?

Selecione uma das seguintes:

The DNS address has been commented out in the configuration file.
The search entry in the /etc/resolv.conf file is incorrect.
Wired connection 1 is offline.
No default route is defined.

Explicação

Questão 79 de 171

A Linux administrator is installing a web server and needs to check whether web traffic has already been allowed through the firewall. Which of the following commands should the administrator use to accomplish this task?

Selecione uma das seguintes:

firewalld query-service-http
firewall-cmd --check-service http
firewall-cmd --query-service http
firewall --check-service http

Explicação

Questão 80 de 171

A Linux administrator wants to find out whether files from the wget package have been altered since they were installed. Which of the following commands will provide the correct information?

Selecione uma das seguintes:

rpm -i wget
rpm -qf wget
rpm -F wget
rpm -V wget

Explicação

Questão 81 de 171

A Linux administrator is troubleshooting a memory-related issue. Based on the output of the commands.
[img]
Which of the following commands would address the issue?

Selecione uma das seguintes:

top -p 8321
kill -9 8321
renice -10 8321
free 8321

Explicação

Questão 82 de 171

A newly created container has been unable to start properly, and a Linux administrator is analyzing the cause of the failure. Which of the following will allow the administrator to determine the FIRST command that is executed inside the container right after it starts?

Selecione uma das seguintes:

docker export <container_id>
docker info <container_id>
docker start <container_id>
docker inspect <container_id>

Explicação

Questão 83 de 171

Using AD Query, the security gateway connections to the Active Directory Domain Controllers using what protocol?

Selecione uma das seguintes:

Windows Management Instrumentation (WMI)
Hypertext Transfer Protocol Secure (HTTPS)
Lightweight Directory Access Protocol (LDAP)
Remote Desktop Protocol (RDP)

Explicação

Questão 84 de 171

To harden one of the servers, and administrator needs to remove the possibility of remote administrative login via the SSH service. Which of the following should the administrator do?

Selecione uma das seguintes:

Add the line DenyUsers root to the /etc/hosts.deny file.
Set PermitRootLogin to no in the /etc/ssh/sshd_config fie.
Add the line account required pam_nologin. so the /etc/pam.d/sshd file.
Set PubKeyAuthentication to no in the /etc/ssh/ssh_config file.

Explicação

Questão 85 de 171

Some servers in an organization have been comprised. Users are unable to access to the organization's web page and other services. While reviewing the system log, a systems administrator notices messages from the kernel regarding firewall rules:

[img]

Wich of the following commands will remediate and help resolve the issue?

Selecione uma das seguintes:

IPtables -A FORWARD -i eth0 -p tcp --dport 80 -j ACCEPT
IPtables -A FORWARD -i eth0 -p tcp --dport 22 -j ACCEPT
IPtables -A INPUT -i eth0 -p tcp --dport 80 -j ACCEPT
IPtables -A INPUT -i eth0 -p tcp --dport 22 -j ACCEPT
IPtables -A INPUT -i eth0 -p tcp --sport 80 -j ACCEPT
IPtables -A INPUT -i eth0 -p tcp --sport 22 -j ACCEPT
IPtables -A INPUT -i eth0 -p tcp --dport :80 -j ACCEPT
IPtables -A INPUT -i eth0 -p tcp --dport :22 -j ACCEPT

Explicação

Questão 86 de 171

A systems administrator was tasked with assigning the temporary IP address/netmask 192.168.168.1/255.255.255.255 to the interface eth0 of a Linux server.
When adding the address, the following error appears:

#ip address add 192.168.168.1/33 dev eth0
Error: any valid prefix is expected rather than "192.168.168.1.33".

Based on the command and its output above, which of the following is the cause of the issue?

Selecione uma das seguintes:

The CIDR value /33 should be /32 instead.
There is no route to 192.168.168.1/33.
The interface eth0 does not exist.
The IP address 192.168.168.1 is already in use.

Explicação

Questão 87 de 171

A Linux administrator needs to create a new user named user02. However, user02 must be in a different home directory, which is under /comptia/projects. Which of the following commands will accomplish this task?

Selecione uma das seguintes:

useradd -d /comptia/projects user02
useradd -m /comptia/projects user02
useradd -b /comptia/projects user02
useradd -s /comptia/projects user02

Explicação

Questão 88 de 171

An administrator deployed a Linux server that is running a web application on port 6379/tcp.
SELinux is in enforcing mode based an organization policies.
The port is open on the firewall.
Users who are trying to connect to a local instance of the web application receive Error 13, Permission denied.

The administrator ran some commands that resulted in the following ouput:

[img]

Which of the following commands should be used to resolve the issue?

Selecione uma das seguintes:

semanage port -d -t http_port_t -p tcp 6379
semanage port -a -t http_port_t -p tcp 6379
semanage port -a http_port_t -p top 6379
semanage port -I -t http_port_tcp 6379

Explicação

Questão 89 de 171

Which of the following commands is used to configure the default permissions for new files?

Selecione uma das seguintes:

setenforce
sudo
umask
chmod

Explicação

Questão 90 de 171

Developers have requested implementation of a persistent, static route on the application server. Packets sent over the interface eth0 to 10.0.213.5/32 should be routed via 10.0.5.1. Which of the following commands should the administrator run to achieve this goal?

Selecione uma das seguintes:

route -i etho -p add 10.0.213.5 10.0.5.1
route modify eth0 +ipv4.routes "10.0.213.5/32 10.0.5.1"
echo "10.0.213.5 10.0.5.1 eth0" > /proc/net/route
ip route add 10.0.213.5/32 via 10.0.5.1 dev eth0

Explicação

Questão 91 de 171

An administrator needs to make some changes in the laC declaration templates. Which of the following commands would maintain version control?

Selecione uma das seguintes:

git clone https://github.com/comptia/linux+-.git
git push origin
git clone https://github.com/comptia/linux+-.git
git fetch New-Branch
git clone https://github.com/comptia/linux+-.git
git status
git clone https://github.com/comptia/linux+-.git
git checkout -b <new-branch>

Explicação

Questão 92 de 171

Based on a organization's new cybersecurity policies, an administrator has been instructed to ensure that, by default, all new users and groups that are created fall within the specified values below.

[img]

To which of the following configuration files will the required changes needs to be made?

Selecione uma das seguintes:

/etc/login.defs
/etc/security/limits.conf
/etc/default/useradd
/etc/profile

Explicação

Questão 93 de 171

A user is asking the systems administrator for assistance with writing a script to verify whether a file exists. Give the following:

[img]

Which of the following commands should replace the <CONDITIONAL> string?

Selecione uma das seguintes:

if [-f "$filename"]; then
if [-d "$filename"]; then
if [-f "$filename"] then
if [-f "$filename"]; while

Explicação

Questão 94 de 171

A systems administrator is receiving tickets from users who cannot reach the application app that should be listening on port 9443/tcp on a Linux server.

To troubleoshoot the issue, the system administrator runs netstat and receives the following output.

#netstat -anp | grep appd | grep -w LISTEN
tcp 0 0 127.0.0.1:9443 0:0:0:0:* LISTEN 1234/appd

Based on the information above, which of the following is causing the issue?

Selecione uma das seguintes:

The IP address 0.0.0.0 is not valid.
The application is listening on the loopback interface.
The application is listening on port 1234.
The application is not running.

Explicação

Questão 95 de 171

A junior administrator is setting up a new Linux server that is intended to be a used as a router at a remote site. Which of the following parameters will accomplish this goal?

Selecione uma das seguintes:

echo 1 > /proc/sys/net/ipv4/ip_forward
iptables -t nat -A PREROUTING -i eth0 -j MASQUERADE
echo 1 > /proc/sys/net/ipv4/ip_forward
iptables -t nat -D POSTROUTING -o eth0 -j MASQUERADE
echo 1 > /proc/sys/net/ipv4/ip_forward
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
echo 1 > /proc/sys/net/ipv4/ip_forward
iptables -t nat -A PREROUTING -o eth0 -j MASQUERADE

Explicação

Questão 96 de 171

A Linux administrator is troubleshooting an issue in which an application service failed to start on a Linux server. The administrator runs a few commands and gets the following ouputs:

[img]

Based on the above ouputs, which of the following is the MOST likely action the administrator should take to resolve this issue?

Based

Selecione uma das seguintes:

Enable the logsearch.service and restart the service.
Increase the TimeoutStartUSec configuration for the logsearch.service
Update the OnCalendar configuration to schedule the start of the logsearch.service.
Update the KillSignal configuration for the logsearch.service to use TERM.

Explicação

Questão 97 de 171

A Linux enginner has been notified about the possible deletion of logs from the file /opt/app/logs. The enginner needs to ensure the log file can only be written into without removing previous entries.

#lsattz /opt/app/logs
------------------e--- logs

Which of the following commands would be BEST to use to accomplish this task?

Selecione uma das seguintes:

chattr +a /opt/app/logs
chattr +d /opt/app/logs
chattr +i /opt/app/logs
chattr +c /opt/app/logs

Explicação

Questão 98 de 171

A Linux administrator needs to connect securely to a remote server in order to install application software. Which of the following commands would allow this connection?

Selecione uma das seguintes:

scp "ABC-key.pem" root@10.0.0.1
sftp root@10.0.0.1
telnet 10.0.0.1 80
ssh -i "ABC-key.perm" root@10.0.0.1
sftp "ABC-key.perm" root@10.0.0.1

Explicação

Questão 99 de 171

A Linux systems administrator is setting up a new web server and getting 404 -NOT FOUND errors while trying to access the web server pages from the browser. While working on the diagnosis of this issue, the Linux system administrator executes the following commands:

[img]

Which of the following commands will BEST resolve this issue?

Selecione uma das seguintes:

sed -i 's/SELINUX=enforcing/SELINUX=disabled/' /etc/selinux/config
restorecon -R -v /var/www/html
setenforce 0
setsebool -P hhtpd_can_network_connect_db on

Explicação

Questão 100 de 171

After installing some RPM packages, a systems administrator discovers the last package that was installed was not needed. Which of the following commands can be used to remove the package?

Selecione uma das seguintes:

dnf remove packagename
apt-get remove packagename
rpm -i packagename
apt remove packagename

Explicação

Questão 101 de 171

A systems administrator has been tasked with disabling the nginx service from the environment to prevent it from being automatically and manually started. Which of the following commands will accomplish this task?

Selecione uma das seguintes:

systemctl cancel nginx
systemctl disable ngninx
systemctl mask nginx
systemctl stop nginx

Explicação

Questão 102 de 171

An administrator is trying to diagnose a performance issue and is reviewing the following output:

[img]

Based on the above ouput, which of the following BEST describes the root cause?

Selecione uma das seguintes:

The system has reached its maximum IOPS, causing the system to be slow.
The system has reached its maximum permitted throughput, therefore iowait is increasing.
The system is motly idle, therefore the iowait is high.
The system has a partitioned disk, which cuases the IOPS to be doubled.

Explicação

Questão 103 de 171

Severals users reported that they were unable to write data to the /oracle1 directory. The following ouput has been provided.

[img]

Which of the following commands should the administrator use to diagnose the issue?

Selecione uma das seguintes:

df -i /oracle1
fdisk -1 /dev/sdb1
lsblk /dev/sdb1
du -sh /oracle1

Explicação

Questão 104 de 171

A Linux administrator needs to correct the permissions of a log file on the server. Which of the following commands should be used to set filename.log permissions to -rwxr--r--.?

Selecione uma das seguintes:

chmod 755 filename.log
chmod 640 filename.log
chmod 740 filename.log
chmod 744 filename.log

Explicação

Questão 105 de 171

A Linux administrator cloned an existing Linux server and built a new server from that clone. The administrator encountered the following error after booting the cloned server.

Device mismatch detected.

The administrator performed the commands listen below to further troubleshoot and mount the missing filesystem:

[img]

Which of the following should administrator use to resolve the device mismatch issue and mount the disk?
Which of the following

Selecione uma das seguintes:

mount disk by device-id
fsck -A
mount disk by-label
mount disk by-blkid

Explicação

Questão 106 de 171

A Linux engineer set up two local DNS server (10.10.10.10 and 10.10.10.20) and was testing email connectivity to the local mail server using the mail command on a local machine when the following error appeared:

Send-mail: Cannot open mail:25

The local machine DNS settings are:

[img]

Which of the following commands could the engineer use to query the DNS server to get mail server information?

Selecione uma das seguintes:

dig@example.com 10.10.10.20 a
dig@10.10.10.20 example.com.mx
dig@example.com 10.10.10.20 ptr
dig@10.10.10.20 example.com ns

Explicação

Questão 107 de 171

A developer has been unable to remove a particular data folder that a team no longer uses. The developer escalated the issue to the systems administrator. The following ouput was received:

[img]

Which of the following commands can be used to resolve this issue?

Selecione uma das seguintes:

chgrp -R 755 data/
chmod -R 777 data/
chattr -R -i data/
chown -R data/

Explicação

Questão 108 de 171

A systems administrator made some changes in the ~/.bashrc file and added an alias command. When the administrator tried to use the alias command, it did not work. Which of the following should be executed FIRST?

Selecione uma das seguintes:

source ~/.bashrc
read ~./bashrc
touch ~./bashrc
echo ~./bashrc

Explicação

Questão 109 de 171

A system administrator needs to clone the partition /dev/sdc1 to /dev/sdd1. Which of the following commands will accomplish this task?

Selecione uma das seguintes:

tar -cvzf /dev/sdd1 /dev/sdc1
rsync /dev/sdc1 /dev/sdd1
dd if=/dev/sdc1 of=/dev/sdd1
scp /dev/sdc1 /dev/sdd1

Explicação

Questão 110 de 171

A Linux engineer needs to create a custom script, cleanup.sh, to run a boot as part of the system services. Which of the following processes would accomplish this task?

Selecione uma das seguintes:

Create a unit file in the /etc/default/ directory.
systemctl enable cleanup
systemctl is-enabled cleanup
Create a unit file in the /etc/ske1/directory.
systemctl enable cleanup
systemctl is-enable cleanup
Create a unit file in the /etc/systemd/system/ directory.
systemctl enable cleanup
systemctl is-enable cleanup
Create a unit file in the /etc/sysctl.d/ directory.
systemctl enable cleanup
systemctl is-enable cleanup

Explicação

Questão 111 de 171

A new file was added to a main Git repository. An administrator wants to synchronize a local copy with the contents of the main repository. Which of the following commands should the administrator use for this task?

Selecione uma das seguintes:

git reflog
git pull
git status
git push

Explicação

Questão 112 de 171

A Linux systems administrator receives reports from various users that an application hosted on a server has stopped responding at similar times for several days in a row. The administrator logs in to the system and obtains the following ouput:

[img]

Which of the following should the administrator do to provide the BEST solution for the reported issue?

Selecione uma das seguintes:

Configure memory allocation policies during business hours and prevent the Java process from going into a zombie state while the server is idle.
Configure a different nice value for the Java process to allow for more users and prevent the Java process from restarting during business hours.
Configure more CPU core to allow for the server to allocate more processing and prevent the Java process from consuming all of the available resources.
Configure the swap space to allow for spikes in usage during peak hours and prevent the Java process from stopping due to a lack of memory.

Explicação

Questão 113 de 171

A systems administrator is deploying three identical, cloud-based servers. The administrator is using the following code to complete the task:

[img]

Which of the following technologies is the administrator using?

Selecione uma das seguintes:

Ansible
Puppet
Chef
Terraform

Explicação

Questão 114 de 171

User1 is a member of the accounting group. Members of this group need to be able to execute but not make changes to a script maintained by User2. The script should not be accessible to other users or groups. Which of the following will give propper access to the script?

Selecione uma das seguintes:

chown user2:accounting script.sh
chmod 750 script.sh
chown user1:accounting script.sh
chmod 777 script.sh
chown accounting:user1 script.sh
chmod 057 script.sh
chown user2:accounting script.sh
chmod u+x script.sh

Explicação

Questão 115 de 171

A systems administrator is tasked with preventing logins from accounts other than root, while the file /etc/nologin exists. Which of the following PAM modules will accomplish this task?

Selecione uma das seguintes:

pam_login.so
pam_access.so
pam_logindef.so
pam_nologin.so

Explicação

Questão 116 de 171

A systems administrator is compiling a report containing information about processes that are listening on the network ports of a Linux server. Which of the following commands will allow the administrator to obtain the needed information?

Selecione uma das seguintes:

ss -plnt
tcpdump -nL
netstat -pn
lsof -lt

Explicação

Questão 117 de 171

What is the main objective when using Application Control?

Selecione uma das seguintes:

To filter out specific content.
To assist the firewall blade with handling traffic.
To see what users are doing.
Ensure security and privacy of information.

Explicação

Questão 118 de 171

A Linux system administrator receives a notification that one of the server's filesystem is full. Which of the following commands would help the administrator to identify this filesystem?

Selecione uma das seguintes:

lsblk
fdisk
df -h
du -ah

Explicação

Questão 119 de 171

A cloud engineer needs to change the secure remote login port from 22 to 49000. Which of the following files should the engineer modify to change the port number to the desired value?

Selecione uma das seguintes:

/etc/host.conf
/etc/hostname
/etc/services
/etc/ssh/sshd_config

Explicação

Questão 120 de 171

A developer is trying to install an application remotly that requires a graphical interface for installation. The developer requested assistance to set up the necessary environment variables along with X11 forwarding in SSH. Which of the following environment variables must be set in remote shell in order to launch the graphical interface?

Selecione uma das seguintes:

$RHOST
SETENV
$SHELL
$DISPLAY

Explicação

Questão 121 de 171

Which of the following technologies can be used as a central repository of Linux users and groups?

Selecione uma das seguintes:

LDAP
MFA
SSO
PAM

Explicação

Questão 122 de 171

A systems administrator created a web server for the company and is required to add a tag for the API so end users can connect. Which of the following would the administrator do to complete this requirement?

Selecione uma das seguintes:

hostnamectl status --no-ask-password
hostnamectl set-hostname "$(perl -le "print" "A" x86)"
hostnamectl set-hostname Comptia-WebNode -H root@192.168.2.14
hostnamectl set-hostname Comptia-WebNode --transient

Explicação

Questão 123 de 171

A Linux administrator needs to determine whether a hostname is in the DNS. Which of the following would supply the information that is needed?

Selecione uma das seguintes:

nslookup
rsync
netstat
host

Explicação

Questão 124 de 171

A systems administrator wants to back up the directory /data and all its contents to /backup/data on a remote server named remote. Which of the following commands will achieve the desired effect?

Selecione uma das seguintes:

scp -p /data remote:/backup/data
ssh -i /remote:/backup/ /data
rsync -a /data remote:/backup/
cp -r /data/remote/backup

Explicação

Questão 125 de 171

A systems administrator received a notification that a system is performing slowly. When running the top command, the systems administrator can see the following values:

[img]

Which of the following commands will the administrator most likely run NEXT?

Selecione uma das seguintes:

vmstat
strace
htop
lsof

Explicação

Questão 126 de 171

A Linux administrator is troubleshooting the root cause of a high CPU load and average.

[img]

Which of the following commands will permanently resolve the issue?

Selecione uma das seguintes:

renice -n -20 6295
pstree -p 6295
iostat -cy 1 5
kill -9 6295

Explicação

Questão 127 de 171

A Linux systems administrator needs to persistently enable IPv4 forwarding in one of the Linux systems. Which of the following commands can be used together to accomplish this task? (Choose two.)

Selecione uma ou mais das seguintes:

sysctl net.ipv4.ip_forward
sysctl -w net.ipv4.ip_forward=1
echo "net.ipv4.ip_forward=1" >> /etc/sysctl.conf
echo 1 > /proc/sys/net/ipv4/ip_forward
sysctl -p
echo "net.ipv6.conf.all.forwarding=l" >> /etc/sysctl.conf

Explicação

Questão 128 de 171

A Linux administrator is trying to remove the ACL from the file /home/user/data.txt but receives the following error message:

setfacl: data.txt: operation not permitted

Given the following analysis:

[img]

Which of the following is causing the error message?

Selecione uma das seguintes:

The administrator is not using a highly privileged account.
The filesystem is mounted with the wrong options.
SELinux file context is denying the ACL changes.
File attributes are preventing file modification.

Explicação

Questão 129 de 171

Which of the following tools is commonly used for creating CI/CD pipelines?

Selecione uma das seguintes:

Chef
Puppet
Jenkins
Ansible

Explicação

Questão 130 de 171

A Linux administrator needs to obtain a list of all volumes that are part of a volume group. Which of the following commands should the administrator use to accomplish this task?

Selecione uma das seguintes:

vgs
lvs
fdisk -1
pvs

Explicação

Questão 131 de 171

A DevOps engineer needs to download a Git repository from https://git.company.com/admin/project.git. Which of the following commands will achieve this goal?

Selecione uma das seguintes:

git clone https://git.company.com/admin/project.git
git checkout https://git.company.com/admin/project.git
git pull https://git.company.com/admin/project.git
git branch https://git.company.com/admin/project.git

Explicação

Questão 132 de 171

A Linux system fails to start and delievers the following error message:

[img]

Which of the following commands can be used to address this issue?

Selecione uma das seguintes:

fsck.ext4 /dev/sda1
partprobe /dev/sda1
fdisk /dev/sda1
mkfs.ext4 /dev/sda1

Explicação

Questão 133 de 171

A Linux administrator rebooted a server. Users then reported some of their files were missing. After doing some troubleshooting, the administrator found one of the filesystem was missing. The filesystem was not listed in /etc/fstab and might have been mounted manually by someone prior the reboot. Which of the following would prevent this issue from reoccurring in the future?

Selecione uma das seguintes:

Sync the mounts units.
Mount the filesystem manually.
Create a mount unit and enable it to be started at boot.
Remount all the missing filesystems.

Explicação

Questão 134 de 171

A Linux engineer needs to download a ZIP file and wants to set the nice value to -10 for this new process. Which of the following commands will help to accomplish the task?

Selecione uma das seguintes:

nice -v -10 wget https://foo.com/installation.zip
renice -v -10 wget https://foo.com/installation.zip
renice -10 wget https://foo.com/installation.zip
nice -10 wget https://foo.com/installation.zip

Explicação

Questão 135 de 171

A systems administrator needs to check if the service systemd-resolved.service is running without any errors. Which of the following commands will show this information?

Selecione uma das seguintes:

systemctl status systemd-resolved.service
systemctl enable systemd-resolved.service
systemctl mask systemd-resolved.service
systemctl show system

Explicação

Questão 136 de 171

A Linux administrator needs to expand a volume group using a new disk. Which of the following options presents the correct sequence of commands to accomplish the task?

Selecione uma das seguintes:

partprobe
vpcreate
lvextend
lvcreate
fdisk
partprobe
fdisk
partprobe
mkfs
fdisk
pvcreate
vgextend

Explicação

Questão 137 de 171

A Linux system is failing to start due to issues with several critical system processes. Which of the following options can be used to boot the system into the single user mode? (Choose two).

Selecione uma ou mais das seguintes:

Execute the following command from the GRUB rescue shell: mount -o remount, ro/sysroot.
Interrupt the boot process in the GRUB menu and add systemd.unit=single in the kernel line.
Interrupt the boot process in the GRUB menu and add systemd.unit=rescue.target in the kernel line.
Interrupt the boot process in the GRUB menu and add single=user in the kernel line.
Interrupt the boot process in the GRUB menu and add init=/bin/bash in the kernel line.
Interrupt the boot process in the GRUB menu and add systemd.unit=single.target in the kernel line.

Explicação

Questão 138 de 171

Junior system administrator had trouble installing and running an Apache web server on a Linux server. You have been tasked with installing the Apache web server on the Linux server and resolving the issue that prevented the junior administrator from running Apache.

INSTRUCTIONS
Install Apache and start the service. Verify that the Apache service is running with the defaults.
Typing "help" in the terminal will show a list of relevant event commands.

If any time would like to bring back the initial state of the simulation, please click the Reset All button.

❌
systemctl --now enable httpd
systemctl status httpd
netstat -tunlp | grep 80
pkill <processname>
systemctl restart httpd
systemctl status httpd

Arraste e solte para completar o texto.

yum install httpd

systemctl --now enable httpd

(check 1) systemctl status httpd

netstat -tunlp | grep 80

pkill

systemctl restart httpd

(check2) systemctl status httpd

Explicação

Questão 139 de 171

A Linux systems administrator needs to copy files and directories from Server A to Server B. Which of the following commands can be used for this purpose? (Choose two).

Selecione uma ou mais das seguintes:

rsyslog
cp
rsync
reposync
scp
ssh

Explicação

Questão 140 de 171

Rugged appliances are small appliances with ruggedized hardware and like Quantum Spark appliance they use which operating system?

Selecione uma das seguintes:

Centos Linux
Gaia embedded
Gaia
Red Hat Enterprise Linux version 5

Explicação

Questão 141 de 171

As a System Administrator, to reduce disk space, you were tasked to create a shell script that does the following:
Add a relevant content to /tmp/script.sh, so that it finds and compresses related files in /var/log/ without recursion.

INTRUCTIONS
Drag and drop snippets to fill the blanks to build a script that performs the actual compression of rotated log files.

If at any time you would like to bring back the initial state of the simulation, please click the Reset All button.

Arraste a resposta correta para cada ponto laranja.

egrep

"$log.[1-6]$"

"log.[1-6]$"

for

while

repeat

then

/tmp/tempfile

/var/log

filename

gzip

rar

tar

awk

done

until

Explicação

Questão 142 de 171

A systems administrator needs to verify whether the built container has the app.go file in its root directory. Which of the following can the administrator use to verify the root directory has this file?

Selecione uma das seguintes:

docker image inspect
docker container inspect
docker exec <container_name> ls
docker ps <container_name>

Explicação

Questão 143 de 171

A DevOps engineer needs to allow incoming traffic to ports in the range of 4000 to 5000 on a Linux server. Which of the following commands will enforce this rule?

Selecione uma das seguintes:

iptables -f filter -l INPUT -p tcp --dport 4000:5000 -A ACCEPT
iptables -t filter -A INPUT -p tcp --dport 4000:5000 j ACCEPT
iptables filer -A INPUT -p tcp --dport 4000:5000 -D ACCEPT
iptables filter -S INPUT -p tcp --dport 4000:5000 -A ACCEPT

Explicação

Questão 144 de 171

Which of the following data structure is written in JSON?

Selecione uma das seguintes:

---
name: user1
position: DevOps
floor: 3
<table>
<thbody><tr>
<td>user1</td>
<td>DevOps</td>
<td>3</td>
</tr>
</tbody></table>
<root>
<floor>3</floor>
<name>user1</name>
<position>DevOps</position>
</root>
{
"name": "user1",
"job": "DevOps",
"floor":3
}

Explicação

Questão 145 de 171

Which of the following directories is the mount point in a UEFI system?

Selecione uma das seguintes:

/sys/efi
/boot/efi
/efi
/etc/efi

Explicação

Questão 146 de 171

A Linux administrator needs to remove software from the server. Which of the following RPM options should be used?

Selecione uma das seguintes:

rpm -s
rpm -d
rpm -q
rpm -e

Explicação

Questão 147 de 171

In which of the following filesystems are system logs commonly stored?

Selecione uma das seguintes:

/var
/tmp
/etc
/opt

Explicação

Questão 148 de 171

Which of the following is a function of a bootloader?

Selecione uma das seguintes:

It initializes all the devices that are required to load the OS.
It mounts the root filesystem that is required to load the OS.
It helps to load the different kernels to initiate the OS startup process.
It triggers the start of all the system services.

Explicação

Questão 149 de 171

A Linux administrator has logged in to a server for the first time and needs to know which services are allowed through the firewall. Which of the following options will return the results for which the administrator is looking?

Selecione uma das seguintes:

firewall-cmd --get-services
firewall-cmd --check-config
firewall-cmd --list-services
systemctl status firewalld

Explicação

Questão 150 de 171

A systems administrator is checking the system logs. The administrator wants to look at the last 20 lines of a log. Which of the following will execute the command?

Selecione uma das seguintes:

tail -v 20
tail -n 20
tail -c 20
tail -l 20

Explicação

Questão 151 de 171

A systems administrator created a new Docker image called test. After building the image, the administrator forgot to version the release. Which of the following will allow the administrator to assign the v1 version to the image?

Selecione uma das seguintes:

docker image save test test:v1
docker image build test:vl
docker image tag test test:vl
docker image version test:v1

Explicação

Questão 152 de 171

A Linux administrator copied a Git repository locally, created a feature branch, and commited some changes to the feature branch. Which of the following Git actions should the Linux administrator use to publish the changes to the main brach of the remote repository?

Selecione uma das seguintes:

rebase
tag
commit
push

Explicação

Questão 153 de 171

A Linux system is failing to boot with the following error:

error: no such partitions
Entering rescue mode...
grub rescue>

Which of the following actions will resolve this issue? (Choose two).

Selecione uma ou mais das seguintes:

Execute grub-install --root-directory=/mnt and reboot.
Execute grub-install /dev/sdX and reboot.
Interrupt the boot process in the GRUB menu and add rescue to the kernel line.
Fix the partition modifying /etc/default/grub and reboot.
Interrupt the boot process in the GRUB menu and add single to the kernel line.
Boot the system on a LiveCD/ISO.

Explicação

Questão 154 de 171

A Linux administrator needs to redirect all HTTP traffic temporarily to the new proxy server 192.0.2.25 on port 3128. Which of the following commands will accomplish this task?

Selecione uma das seguintes:

iptables -t nat -D PREROUTING -p tcp --sport 80 -j DNAT --to-destination 192.0.2.25:3128
iptables -t nat -A PREROUTING -p top -dport 81 -j DNAT --to-destination 192.0.2.25:3129
iptables -t nat -I PREROUTING -p top --sport 80 -j DNAT --to-destination 192.0.2.25:3129
iptables -t nat -A PREROUTING -p tcp --dport 80 -j DNAT --to-destination 192.0.2.25:3128

Explicação

Questão 155 de 171

Due to low disk space, a Linux administrator finding and removing all log files that were modified more than 180 days ago. Which of the following commands will accomplish this task?

Selecione uma das seguintes:

find /var/log -type d -mtime +180 -print -exec rm{}/;
find /var/log -type f -modified +180 -rm
find /var/log -type f -mtime +180 -exec rm {} /
find /var/log -type c -atime +180 -remove

Explicação

Questão 156 de 171

A cloud engineer is asked to copy the file deployment.yaml from a container to the host where the container is running. Which of the following commands can accomplish this task?

Selecione uma das seguintes:

docker cp container_id/deployment.yaml deployment.yaml
docker cp container_id:/deployment.yaml deployment.yaml
docker cp deployment.yaml local://deployment.yaml
docker cp container_id/deployment.yaml local://deplyment.yaml

Explicação

Questão 157 de 171

A Linux administrator created the directory /project/access2all. By creating this directory, the administrator is trying to avoid the deletion or modification of files from non-owners. Which of the following will accomplish this goal?

Selecione uma das seguintes:

chmod +t /project/access2all
chmod +rws /project/access2all
chmod 2770 /project/access2all
chmod ugo+rwx /project/access2all

Explicação

Questão 158 de 171

A systems administrator is investigating an issue in which one of the servers is not booting up properly. The journalctl entries show the following:

[img]

Which of the following will allow the administrator to boot the Linux system to normal mode quickly?

Selecione uma das seguintes:

Comment out the /opt/app filesystem in /etc/fstab and reboot.
Reformat the /opt/app filesystem and reboot.
Perform filesystem checks on local filesystems and reboot.
Trigger a filesystem relabel and reboot.

Explicação

Questão 159 de 171

A system administrator configured firewall rules using firewalld. However, after the system is rebooted, the firewall rules are not present:

[img]

Which of the following is the reason the firewall rules are not active?

Selecione uma das seguintes:

iptables is conflicting with firewalld.
The wrong system target is actived.
FIREWALL_ARGS has no value assigned.
The firewalld service is not enanbled.

Explicação

Questão 160 de 171

A systems administrator is implementing a new service task with systems at startup and needs to execute a script entitled test.sh with the following content:

TIMESTAMP=$ (date '+%Y-%m-%d %H:%M:%S')
echo "helpme.service: timestamp $(Timestamp)" | systemd -cat -p info
sleep 60
done

The administrator tries to run the sript after making it executable with chmod +x; however, the script will not run. Which of the following should the administrator do the address this issue? (Choose two).

Selecione uma ou mais das seguintes:

Add #!/bin/bash to the bottom of the script.
Create a unit file for the new service in /etc/systemd/system/ with the name helpme.service in the location
Add #!/bin/bash to the top of the script
Restart the computer to enable the new service.
Create a unit file for the new service in /etc/init.d with the name helpme.service in the location.
Shut down the computer to enable the new service.

Explicação

Questão 161 de 171

A Linux administrator was tasked with deleting all files and directories with names that are contained in the sobelete.txt file. Which of the following commands will accomplish this task?

Selecione uma das seguintes:

xargs -f cat toDelete.txt -rm
rm -d -r -f toDelete.txt
cat toDelete.txt | rm -frd
cat toDelete.txt | xargs rm -rf

Explicação

Questão 162 de 171

After installing a new version of a package, a systems administrator notices a new version of the corresponding .service file was installed. In order to use the new version of the .service file, which of the following commands must be issued FIRST?

Selecione uma das seguintes:

systemctl status
systemctl stop
systemctl reinstall
systemctl daemon-reload

Explicação

Questão 163 de 171

A Linux system is failing to boot. The following error is displayed in the serial console:

[[1;33mDEPEND[Om] Dependency failed for /data.
[[1;33mDEPEND[Om] Dependency failed for Local File Systems.

Welcome to emergency model After logging in, type "journalctl -xb" to viewsystem logs, "systemctl reboot" to reboot, "systemctl default" to try again to boot into default mode.
Give root password for maintenance
(or type Control-D to continue}

Which of the following files will need to be modified for this server to be able to boot again?

Selecione uma das seguintes:

/etc/mtab
/dev/sda
/etc/fstab
/etc/grub.conf

Explicação

Questão 164 de 171

A system administrator is troubleshooting a connectivity issue pertaining to access to a system named db.example.com. The system IP address should be 192.168.20.88. The administrator issues the dig command and receives the following output:

;;ANSWER SECTION:
db.example.com. 15 IN A 192.168.20.89

The administrator runs grep db.example.com /etc/hosts and receives the following output:

192.168.20.89 db.example.com

Given this scenario, which of the following should the administrator do to address this issue?

Selecione uma das seguintes:

Modify the /etc/hosts file and change the db.example.com entry to 192.168.20.89.
Modify the /etc/network file and change the db.example.com entry to 192.168.20.88.
Modify the /etc/network file and change the db.example.com entry to 192.168.20.89.
Modify the /etc/hosts file and change the db.example.com entry to 192.168.20.88.

Explicação

Questão 165 de 171

A server is experiencing intermittent connection issues. Some connections to the Internet work as intended, but some fail as if there is no connectivity. The systems administrator inspects the server configuration:

[img]

Which of the following is MOST likely the cause of the issue?

Selecione uma das seguintes:

An internal-only DNS server is configured.
The IP netmask is wrong for ens3.
Two default routes are configured.
The ARP table contains incorrect entries.

Explicação

Questão 166 de 171

Joe, a user, is unable to log in to the Linux system. Given the following ouput:

[img]

Which of the following commands would resolve the issue?

Selecione uma das seguintes:

usermod -s /bin/bash joe
pam_tally2 -u joe -r
passwd -u joe
change -E 90 joe

Explicação

Questão 167 de 171

In order to copy data from another VLAN, a systems administrator wants to temporarily assign IP address 10.0.6.5/24 to the newly added network interface enpls0f1. Which of the following commands should the administrator run to achieve the goal?

Selecione uma das seguintes:

ip addr add 10.0.6.5/24 dev enpls0f1
echo "IPV4_ADDRESS=10.0.6.5/24" > /etc/sysconfig/network-scripts/ifcfg-enpls0f1
ifconfig 10.0.6.5/24 enpsls0f1
nmcli conn add ipv4.address=10.0.6.5/24 if name snspls0f1

Explicação

Questão 168 de 171

A Linux administrator booted up the server and was presented with a non-GUI terminal. The administrator ran the command systemctl isolate graphical.target and rebooted the system by running systemctl reboot, which fixed the issue?

Selecione uma das seguintes:

The administrator did not reboot the server properly.
The administrator did not set the default target to basic.target.
The administrator did not set the default target to graphical.target.
The administrator did not shut down the server properly.

Explicação

Questão 169 de 171

Users have been unable to save documents to /home/tmp/temp and have been receiving the following error:

Path not found

A junior technician checks the locations and see that /home/tmp/tempa was accidentally created instead of /home/tmp/temp. Which of the following commands should the technician use to fix this issue?

Selecione uma das seguintes:

cp /home/tmp/tempa /home/tmp/temp
mv /home/tmp/tempa /home/tmp/temp
cd /temp/tmp/tempa
ls /home/tmp/tempa

Explicação

Questão 170 de 171

A systems administrator is encountering performance issues. The administrator runs a command with the following output:

09:10:18 up 457 days, 32 min, 5 users, load average: 4.22 6.63 5.58

The Linux server has the following system properties:

CPU4 vCPU
Memory: 50GB

Which of the following accurately describes this situation?

Selecione uma das seguintes:

The system is under CPU pressure and will requires additional vCPUs.
The system has been running for over a year and requires a reboot.
Too many users are currently logged in to the system.
The system requires more memory.

Explicação

Questão 171 de 171

A Linux administrator found many containers in an exited state. Which of the following commands will allow the administrator to clean up the contaners in an exited state?

Selecione uma das seguintes:

docker rm --all
docker rm $(docker ps -aq)
docker images prune*
docker rm --state exited

Explicação

Verificar resposta

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	Criado por Sc Con quase 2 anos atrás

Recurso de estudio para certificación CompTIA Linux + XK005.

CompTIA Linux+ XK005 (171Q).

Questão 1 de 171

A systems administrator pressed Ctrl+Z after starting a program using the command line, and the shell prompt was presented. In order to go back to the program, which of the following commands can the administrator use?

Selecione uma das seguintes:

Explicação

Questão 2 de 171

A Linux administrator is alerted to a storage capacity issue on a server without a specific mount point or directory. Which of the following commands would be MOST helpful for troubleshooting? (Choose two).

Selecione uma ou mais das seguintes:

Explicação

Questão 3 de 171

A Linux administrator needs to resolve a service that has failed to start. The administrator runs the following command: ls -l startup file The following output is retorned ---------. root root 81k Sep 13 19:01 startupfile Which of the following is MOST likely the issue?

Selecione uma das seguintes:

Explicação

Questão 4 de 171

Selecione uma das seguintes:

Explicação

Questão 5 de 171

A cloud engineer needs to launch a container named web-01 in background mode. Which of the following commands will accomplish this task?

Selecione uma das seguintes:

Explicação

Questão 6 de 171

A Linux administrator is tasked with adding users to the system. However, the administrator wants to ensure ther users access will be disebled once the project is over. The expiration date should be 2021-09-30. Which of the following commands will accomplish this task?

Selecione uma das seguintes:

Explicação

Questão 7 de 171

A systems administrator frequently connects to a remote host via SSH and a non-standard port. The system administrator would like to avoid passing the port parameter on the command line every time. Which of the following files can be used to set a different port value for that host?

Selecione uma das seguintes:

Explicação

Questão 8 de 171

Selecione uma das seguintes:

Explicação

Questão 9 de 171

A Linux administrator needs to analyze a failing application that is running inside a container. Which of the following commands allows the Linux administrator to enter the running container and analyze the logs that are stored inside?

Selecione uma das seguintes:

Explicação

Questão 10 de 171

A Linux administrator was asked to run a container with the httpd server inside. This container should be exposed at port 443 of a Linux host machine while it internally listens on port 8443. Which of the following commands will accomplish this task?

Selecione uma das seguintes:

Explicação

Questão 11 de 171

A systems administrator requires that all files that are created by the user named web have read-only permissions by the owner. Which of the following commands will satisfy this requirement?

Selecione uma das seguintes:

Explicação

Questão 12 de 171

Selecione uma das seguintes:

Explicação

Questão 13 de 171

Selecione uma ou mais das seguintes:

Explicação

Questão 14 de 171

Selecione uma das seguintes:

Explicação

Questão 15 de 171

A Linux administrator is providing a new Nginx image from the registry to local cache. Which of the following commands would allow this to happen?

Selecione uma das seguintes:

Explicação

Questão 16 de 171

A new Linux systems administrator just generated a pair of SSH keys that should allow connection to the servers. Which of the following commands can be used to copy a key file to remote servers? (Choose two).

Selecione uma ou mais das seguintes:

Explicação

Questão 17 de 171

A Linux engineer is setting the sticky bit on a directory called devops with 755 file permission. Which of the following commands will accomplish this task?

Selecione uma das seguintes:

Explicação

Questão 18 de 171

An administrator accidentally deleted the /boot/vmlinuz file and must resolve the issue before the server is rebooted. Which of the following commands should the administrator use to identify the correct version of this file?

Selecione uma das seguintes:

Explicação

Questão 19 de 171

A Linux administrator was notified that a virtual server has an I/O bottleneck. The Linux administrator analyzes the following ouput: [image] Given there is a single CPU in the server, which of the following is causing the slowness?

Selecione uma das seguintes:

Explicação

Questão 20 de 171

A Linux administrator wants to set the SUID of a file named dev_team.text with 744 access rights. Which of the following commands will achieve this goal?

Selecione uma das seguintes:

Explicação

Questão 21 de 171

Which of the following commands will display the operating system?

Selecione uma das seguintes:

A systems administrator pressed Ctrl+Z after starting a program using the command line, and the shell prompt was presented.
In order to go back to the program, which of the following commands can the administrator use?

A Linux administrator is alerted to a storage capacity issue on a server without a specific mount point or directory.
Which of the following commands would be MOST helpful for troubleshooting? (Choose two).

A Linux administrator needs to resolve a service that has failed to start. The administrator runs the following command:

ls -l startup file

The following output is retorned

---------. root root 81k Sep 13 19:01 startupfile

Which of the following is MOST likely the issue?

A cloud engineer needs to launch a container named web-01 in background mode.
Which of the following commands will accomplish this task?

A Linux administrator is tasked with adding users to the system. However, the administrator wants to ensure ther users access will be disebled once the project is over.
The expiration date should be 2021-09-30.
Which of the following commands will accomplish this task?

A systems administrator frequently connects to a remote host via SSH and a non-standard port. The system administrator would like to avoid passing the port parameter on the command line every time.
Which of the following files can be used to set a different port value for that host?

A Linux administrator needs to analyze a failing application that is running inside a container.
Which of the following commands allows the Linux administrator to enter the running container and analyze the logs that are stored inside?

A Linux administrator was asked to run a container with the httpd server inside. This container should be exposed at port 443 of a Linux host machine while it internally listens on port 8443.
Which of the following commands will accomplish this task?

A systems administrator requires that all files that are created by the user named web have read-only permissions by the owner.
Which of the following commands will satisfy this requirement?

A Linux administrator was notified that a virtual server has an I/O bottleneck. The Linux administrator analyzes the following ouput:

[image]

Given there is a single CPU in the server, which of the following is causing the slowness?

A junior Linux administrator is tasked with installing an application. The installation guide states the application should only be installed in a run level 5 environment.

$systemctl get-default
getty.target

Which of the following commands would ensure the server is set to run level 5?

When trying to log in remotely to a server, a user receives the following message:

[image]

Which of the following is causing the issue?