Networking | Quiz

Questão 1 de 200

1

In version field of IPv4 header, when machine is using some other version of IPv4 then datagram is

Selecione uma das seguintes:

Rejected
Accepted
Interpreted
Interpreted incorrectly

Explicação

Questão 2 de 200

1

Network layer at source is responsible for creating a packet from data coming from another

Selecione uma das seguintes:

Station
Link
Node
Protocol

Explicação

Questão 3 de 200

1

Header of datagram in IPv4 has

Selecione uma das seguintes:

0 to 20 bytes
20 to 40 bytes
20 to 60 bytes
20 to 80 bytes

Explicação

Questão 4 de 200

1

An IPv4 datagram can encapsulate data from several higher-level protocols such as UDP, ICMP, IGMP and

Selecione uma das seguintes:

TCP protocols
CDM protocols
ATM protocols
IEEE protocols

Explicação

Questão 5 de 200

1

To record Internet routers of IPv4, that handles datagram is responsibility of

Selecione uma das seguintes:

Record protocol
Record Data
Record Route
Record Header

Explicação

Questão 6 de 200

1

Internet has chosen datagram approach to switching in the

Selecione uma das seguintes:

Data Link Layer
Network Layer
Physical Layer
Presentation Layer

Explicação

Questão 7 de 200

1

In IPv4 protocol, each datagram is handled

Selecione uma das seguintes:

Independently
Dependently
Priority basis
Systematically

Explicação

Questão 8 de 200

1

CCT stands fo

Selecione uma das seguintes:

Close Circuit Transmission
Congestion Controlled Traffic
Congestion Controlled Transmission
Close Circuit Traffic

Explicação

Questão 9 de 200

1

Communication between a computer and a keyboard involves ______________ transmission

Selecione uma das seguintes:

Automatic
Half-duplex
Full-duplex
Single direction

Explicação

Questão 10 de 200

1

Three or more devices share a link in ________ connection

Selecione uma das seguintes:

Unipoint
Multipoint
Point to point
None

Explicação

Questão 11 de 200

1

In asynchronous serial communication the physical layer provide

Selecione uma das seguintes:

start and stop signalling
flow control
both start & stop signalling and flow control
none

Explicação

Questão 12 de 200

1

The physical layer is responsible for

Selecione uma das seguintes:

line coding
channel coding
modulation
all of the mentioned

Explicação

Questão 13 de 200

1

A single channel is shared by multiple signals by

Selecione uma das seguintes:

analog modulation
digital modulation
multiplexing
none

Explicação

Questão 14 de 200

1

Wireless transmission can be done via

Selecione uma das seguintes:

radio waves
microwaves
infrared
all of the mentioned

Explicação

Questão 15 de 200

1

Which is not a application layer protocol?

Selecione uma das seguintes:

HTTP
SMTP
FTP
TCP

Explicação

Questão 16 de 200

1

The packet of information at the application layer is called __________

Selecione uma das seguintes:

Packet
Message
Segment
Frame

Explicação

Questão 17 de 200

1

Which one of the following is an architecture paradigms?

Selecione uma das seguintes:

Peer to peer
Client-server
HTTP
Both Peer-to-Peer & Client-Server

Explicação

Questão 18 de 200

1

Application layer offers _______ service

Selecione uma das seguintes:

End to end
Process to process
Both End to end and Process to process
None of the mentioned

Explicação

Questão 19 de 200

1

E-mail is _________

Selecione uma das seguintes:

Loss-tolerant application
Bandwidth-sensitive application
Elastic application
None of the mentioned

Explicação

Questão 20 de 200

1

To deliver a message to the correct application program running on a host, the _______ address must be consulted

Selecione uma das seguintes:

IP
MAC
Port
None

Explicação

Questão 21 de 200

1

Layers four and five of the Internet protocol stack are implemented in the end systems but not in the routers in the network core

Selecione uma das seguintes:

True
False

Explicação

Questão 22 de 200

1

With ADSL, each subscriber gets more downstream bandwidth than upstream bandwidth

Selecione uma das seguintes:

True
False

Explicação

Questão 23 de 200

1

Two packets A and B are sent in that order through a connection-oriented communication network. They could arrive at the destination:

Selecione uma das seguintes:

in any order, after having traversed the same route.
only in the order A-B, after possibly having traversed different routes.
in any order, after possibly having traversed different routes
only in the order A-B, after having traversed the same route.

Explicação

Questão 24 de 200

1

Two packets A and B are sent in that order through a connectionless communication network. They will arrive at the destination:

Selecione uma das seguintes:

in any order, after possibly having traversed
in the order A-B, after having traversed the same route
in any order, after having traversed the same route.
in the order A-B, after possibly having traversed different routes

Explicação

Questão 25 de 200

1

The Internet received its name in the 1980s because:

Selecione uma das seguintes:

it was an interim (temporary) design of what it later became, but the name stuck.
it was meant to be a network internal to the United States Department of Defense.
it consisted of many interconnected networks.
it achieved international scope with the addition of the City University of London.

Explicação

Questão 26 de 200

1

All store-and-forward networks are

Selecione uma das seguintes:

broadcast networks.
packet or message switched networks.
connection-based networks.
connectionless networks.

Explicação

Questão 27 de 200

1

When a student in Hong Kong uses her computer to have a voice conversation with a teacher in Pittsburgh, the application she uses requires that the network deliver bits at a modest but constant bit rate. This is because, even though voice can be faithfully encoded in less than 64 Kbps, the late arrival of a voice sample produces a noticeable and unpleasant sound effect. Which of the following switching options will give you better quality?

Selecione uma das seguintes:

Packet-switched
Message-switched.
Space-switched.
Circuit-switched

Explicação

Questão 28 de 200

1

The Date: header in the HTTP response message indicates when the object in the response was last modified.

Selecione uma das seguintes:

True
False

Explicação

Questão 29 de 200

1

The process that sends messages into, and receives messages from, the network through a software interface is called a socket.

Selecione uma das seguintes:

True
False

Explicação

Questão 30 de 200

1

The transfer of an html file from one host to another is:

Selecione uma das seguintes:

loss-tolerant and time sensitive
loss-intolerant and time sensitive.
loss-intolerant and time insensitive.
none of the above

Explicação

Questão 31 de 200

1

A browser will generate header lines as a function of

Selecione uma das seguintes:

browser type and version.
user configuration of browser.whether the browser has a cached version of the requested object.
whether the browser has a cached version of the requested object.
all of the above

Explicação

Questão 32 de 200

1

SMTP is used to:

Selecione uma das seguintes:

to transfer messages from one mail server to another
to transfer messages from mail server to a user agent.
to define the format of message headers.
all of the above.

Explicação

Questão 33 de 200

1

DNS resource record has Type=MX. Then:

Selecione uma das seguintes:

Value is the hostname of the DNS server that is authoritative for Name.
Value is the IP address of the mail server that has the alias hostname Name.
Value is the hostname of the mail server that has the alias hostname Name.
none of the above.

Explicação

Questão 34 de 200

1

Local DNS name servers:

Selecione uma das seguintes:

cache resource records, but discard them after a period of time that is on the order of a few days
cache resource records and never discard them.
obtain resource records from Web caches.
never cache resource records

Explicação

Questão 35 de 200

1

Consider an HTTP Web server using persistent connections. Suppose the server spawns a separate process for each client that connects to the server. Then each of these spawned processes will have different server port numbers.

Selecione uma das seguintes:

True
False

Explicação

Questão 36 de 200

1

The size of the TCP RcvWindow never changes throughout the duration of the connection

Selecione uma das seguintes:

True
False

Explicação

Questão 37 de 200

1

The TCP segment has a field in its header for RcvWindow

Selecione uma das seguintes:

True
False

Explicação

Questão 38 de 200

1

Suppose host A sends host B one segment with sequence number 38 and 4 bytes of data. Then in this same segment the acknowledgement number is necessarily 42

Selecione uma das seguintes:

True
False

Explicação

Questão 39 de 200

1

The MSS is the maximum size of a TCP segment including headers

Selecione uma das seguintes:

True
False

Explicação

Questão 40 de 200

1

When a TCP segment arrives to a host, the socket to which the segment is directed depends on

Selecione uma das seguintes:

the source IP address of the datagram that encapsulated the segment
the destination port numbe
the source port number
all of the above

Explicação

Questão 41 de 200

1

UDP has which of the following characteristics

Selecione uma das seguintes:

regulated send rate
connection state at the server
three-way hand shake for connection establishment
none of the above

Explicação

Questão 42 de 200

1

When a UDP segment arrives to a host, in order to direct the segment to the appropriate socket, the OS uses

Selecione uma das seguintes:

the source port number
the source IP address
the destination port number
all of the above

Explicação

Questão 43 de 200

1

The stop-and-wait protocol is highly inefficient when there is a

Selecione uma das seguintes:

large distance between source and destination and the transmission rate is low
short distance between source and destination and the transmission rate is high
large distance between source and destination and the transmission rate is high
short distance between source and destination and the transmission rate is low

Explicação

Questão 44 de 200

1

Pipelining requires which of the following

Selecione uma das seguintes:

transmitting many packets before receiving acknowledgements
unique sequence numbers for each in-transit packet
sender-side buffering of unacknowledged packets
all of the above

Explicação

Questão 45 de 200

1

Suppose a client sends an HTTP request message with the If-modified-since: header. Suppose the object in a server has not changed since the last time a client retrieved the object. Then the server will send a response message with the status code

Selecione uma das seguintes:

404 Not Foun
200 OK
304 Not Modified
none of the above

Explicação

Questão 46 de 200

1

Streams are not needed in which of the following programs

Selecione uma das seguintes:

TCPserver
UDPserver
TCPclient
UDPclient

Explicação

Questão 47 de 200

1

For BitTorrent, which of the following is true

Selecione uma das seguintes:

Although a peer may have 50 concurrent TCP connections with other peers, at any given instant of time it sends data to less than 10 other peers.
At a given instant of time, a peer A may upload to a peer B, even if peer B is not sending anything to A.
Among the chunks that a peer does not have, the peer will request chunks that appear to be relatively rare in the torrent.
All of the above

Explicação

Questão 48 de 200

1

Consider the latency model for dynamic congestion windows. Which of the following components contribute to latency?

Selecione uma das seguintes:

the sum of all the stalled times
round trip time, RTT
the transmission time of the object, O/R
all of the above

Explicação

Questão 49 de 200

1

TCP applies fast retransmit to a segment when

Selecione uma das seguintes:

it estimates unusually large RTTs
it receives three ACKs for an earlier segment
the segment's timer expires
none of the above

Explicação

Questão 50 de 200

1

Nmap is often used to

Selecione uma das seguintes:

do port scans over a range of ports at a target host
measure throughput between hosts
measure round-trip times between hosts
decipher encrypted traffic

Explicação

Questão 51 de 200

1

With SYN cookies, when a server receives a SYN segment, it returns a SYNACK with

Selecione uma das seguintes:

an initial sequence number that is a hash of the IP addresses and port numbers in the SYN segment (as well as of other things)
initial sequence number 1
a randomly chosen initial sequence number
none of the above

Explicação

Questão 52 de 200

1

Before sending a packet into a datagram network, the source must determine all of the links that packet will traverse between source and destination

Selecione uma das seguintes:

True
False

Explicação

Questão 53 de 200

1

The primary role of a router is to forward datagrams from input links to output links

Selecione uma das seguintes:

True
False

Explicação

Questão 54 de 200

1

A forwarding table is

Selecione uma das seguintes:

Used to find the proper interface to which the input interface should forward a packet
Configured using a centralized routing algorithm
Configured through routing protocol messages received by router
A and C
B and C

Explicação

Questão 55 de 200

1

How are routing paths calculated?

Selecione uma das seguintes:

The full route is mapped out in the datagram’s header.
Paths are calculated by routing algorithms.
Datagrams always flow on the same path and don’t need to be calculated.
The path is calculated based on available network bandwidth

Explicação

Questão 56 de 200

1

A channel partitioning protocol has which of the following characteristics forwarding table is

Selecione uma das seguintes:

it does not generate collisions.
all transmitting nodes get the same amount of bandwidth.
there is no master node.
all of the above

Explicação

Questão 57 de 200

1

Match the following network service to the correct definition

Selecione uma das seguintes:

Guaranteed Delivery - Guarantees a packet will arrive at its destination
Guaranteed Delivery with Bounded Delay- Guarantees delivery within a specified host-to-host delay bound
Guaranteed Maximum Jitter - Guarantees the amount of time between the transmission of two successive packets at the sender is
equal to the amount of time between their receipt at the destination.
Я НЕ ЗНАЮ КАК ДОБАВИТЬ DROP DOWN ВОПРОС ПОЭТОМУ ПРОСТО ЗАПОМНИ ORDER

Explicação

Questão 58 de 200

1

An ARP query packet is encapsulated in an IP datagram.

Selecione uma das seguintes:

a link-layer frame addressed to a specific adapter.
a link-layer broadcast frame.
none of the above

Explicação

Questão 59 de 200

1

Ethernet provides which of the following services to the network layer
error detection

Selecione uma das seguintes:

error detection
flow control
reliable data transfer
all of the above

Explicação

Questão 60 de 200

1

For Ethernet, if an adapter determines that a frame it has just received is addressed to a different adapter

Selecione uma das seguintes:

it discards the frame without sending an error message to the network layer.
it discards the frame and sends an error message to the network layer.
it sends a NACK (not acknowledged frame) to the sending host.
it delivers the frame to the network layer, and lets the network layer decide what to do

Explicação

Questão 61 de 200

1

A beacon frame sent by an AP includes

Selecione uma das seguintes:

the AP's SSID.
the AP's MAC address.
both the AP's MAC address and SSID.
none of the above

Explicação

Questão 62 de 200

1

Packets sent by two stations in 802.11 can collide because

Selecione uma das seguintes:

at a given time, the random backoff values of the two stations are the same.
the packets are sent to different APs but on the same channel.
the two stations could be hidden from each other.
all of the above

Explicação

Questão 63 de 200

1

An 802.11 frame includes

Selecione uma das seguintes:

an acknowledgement field.
a sequence number field.
four address fields.
all of the above

Explicação

Questão 64 de 200

1

Which of the following statements best describes the purpose of the SNMP protocol?

Selecione uma das seguintes:

The SNMP protocol specifies the actions a network manager should take in response to a specific set of network fault conditions.
The SNMP protocol is a tool for gathering data about network conditions and executing remote actions at remote managed devices.
The SNMP protocol is used by the network manager to provision resources, such as bandwidth, server capacity and other computational/communication resources needed to meet the mission-specific needs of an enterprise

Explicação

Questão 65 de 200

1

What is the purpose of the SNMP SetRequest message?

Selecione uma das seguintes:

To allow a managed device to request and receive a set of initial values for MIB objects in the managed device.
To allow a managing entity to query the value of a set of MIB object values in a managed device.
To allow a managing entity to set the value of one or more MIB objects in a managed device

Explicação

Questão 66 de 200

1

What is the purpose of a presentation service?

Selecione uma das seguintes:

To allow a client to inform a server that it (the client) is present and ready to receive data.
To encode, transmit, and translate data from one machine-specific format to another.
To display data in a format specified by a user.
None of the above

Explicação

Questão 67 de 200

1

Filtering in a firewall can be based on:

Selecione uma das seguintes:

source and destination IP addresses
TCP ACK bits
source and destination port numbers
all of the above

Explicação

Questão 68 de 200

1

How we call the link-layer packets?

Selecione uma das seguintes:

Frames
Packets
Datagrams
Segment
Message

Explicação

Questão 69 de 200

1

What is the segment?

Selecione uma das seguintes:

application-layer packet
network-layer packet
data-link-layer packet
transport-layer packet
physical-layer packet

Explicação

Questão 70 de 200

1

Most packets use these as the inputs to the links. This means that the packet switch must receive the entire packet before it can begin to transmit the first bit of the packet onto the outbound link

Selecione uma das seguintes:

Queuing delays
Store-and-forward
Reliable data
Datagram

Explicação

Questão 71 de 200

1

The housing a large number of hosts, is often used to create a powerful virtual server

Selecione uma das seguintes:

Supercomputer
Data center
Server house
Host center

Explicação

Questão 72 de 200

1

Match the following delays to the correct definition

Selecione uma das seguintes:

Processing delay
The time required to examine the packet’s header and determine where to direct the packet
Queuing delay
Packet waits to be transmitted onto the link
Transmission delay
This is the amount of time required to push all of the packet’s bits into the link
Propagation delay
Once a bit is pushed into the link, it needs to be spread to router
просто запомни ))))

Explicação

Questão 73 de 200

1

________________ is a repository of information linked together from points all over the world

Selecione uma das seguintes:

WWW
HTTP
HTML
None

Explicação

Questão 74 de 200

1

In a URL, the _______ is the full name of the file where the information is located

Selecione uma das seguintes:

Path
Protocol
Host
None

Explicação

Questão 75 de 200

1

A cookie is made by the __ and eaten by the _

Selecione uma das seguintes:

Client; client
Client; sever
Sever; server
None

Explicação

Questão 76 de 200

1

In HTTP, the first line in a request message is called a _ line; the first line in the response message is called the __ line

Selecione uma das seguintes:

Request; response
Response; request
Response; status
Header line; request
None

Explicação

Questão 77 de 200

1

DNS provides a few other important service in addition to translating hostnames to IP addresses

Selecione uma ou mais das seguintes:

Host aliasing
Delaying the packets
Congestion control
Load distribution
Mail server aliasing

Explicação

Questão 78 de 200

1

Small piece of data sent from a website and stored in the user's web browser while the user is browsing

Selecione uma das seguintes:

Web cache
Set-cookies
Cookies
Status line

Explicação

Questão 79 de 200

1

A network entity that satisfies HTTP requests on the behalf of an origin Web server

Selecione uma das seguintes:

Web browser
Client
Root servers
Data center
Proxy server
DNS servers

Explicação

Questão 80 de 200

1

How many ports can be per IP address

Selecione uma das seguintes:

65,535
68,535
65,335
64,535
60,535

Explicação

Questão 81 de 200

1

FTP is built on _____ architecture

Selecione uma das seguintes:

Client-server
P2P
Both of the mentioned
None

Explicação

Questão 82 de 200

1

FTP uses _____ parallel TCP connections to transfer a file

Selecione uma das seguintes:

1
2
3
4

Explicação

Questão 83 de 200

1

If 5 files are transfered from server A to client B in the same session. The number of TCP connection between A and B is

Selecione uma das seguintes:

5
10
2
6

Explicação

Questão 84 de 200

1

The password is sent to the server using _____ command

Selecione uma das seguintes:

PASSWD
PASS
PASSWORD
None

Explicação

Questão 85 de 200

1

Time it takes for a small packet to travel from client to server and then back to the client

Selecione uma das seguintes:

RIP
RDT
ARP
TTL
RTT

Explicação

Questão 86 de 200

1

____________is a physical-layer device that acts on individual bits rather than frames

Selecione uma das seguintes:

A hub
A host
Switch
Router

Explicação

Questão 87 de 200

1

Define to which level of the network protocols are belong to

Selecione uma das seguintes:

IMAP,POP3, DNS, FTP, Telnet-Application layer
TCP, UDP-Transport layer
ICMP, RIP, IPv4, IPv6-Network layer
ARP, ATM, Token ring-Data Link layer
Bluetooth, 802.11-Physical layer
ПРОСТО ЗАПОМНИ ВСЕ

Explicação

Questão 88 de 200

1

___________algorithm computes the least-cost path between a source and destination using complete, global knowledge about the network

Selecione uma das seguintes:

Virtual circuit
A global routing
Forwarding
None

Explicação

Questão 89 de 200

1

Computer networks that provide only a connection service at the network layer are called

Selecione uma das seguintes:

Datagram network
Virtual-circuit networks
Network
None

Explicação

Questão 90 de 200

1

Each time an end system wants to send a packet, it stamps the packet with the address of the destination end system and then pops the packet into the network

Selecione uma das seguintes:

Virtual-circuit networks
Network
Datagram network
None

Explicação

Questão 91 de 200

1

Determine the correct class of the following IP address: 93.44.123.184

Selecione uma das seguintes:

A
B
C
D
E

Explicação

Questão 92 de 200

1

Determine the correct class of the following IP address: 160.23.244.224

Selecione uma das seguintes:

A
B
C
D
E

Explicação

Questão 93 de 200

1

Convert the following IP address: 192.224.224.15 to the binary

Selecione uma das seguintes:

11000000. 11100000. 11100000. 00001111
11001100.11000111.11100011. 00001111
01010110. 01111011. 00000001. 00000001
11000100. 00000101. 01111011. 11011101

Explicação

Questão 94 de 200

1

Convert the following IP address: 93.44.123.184 to the binary

Selecione uma das seguintes:

11001100.11000111.11100011. 00001111
01010110. 01111011. 00000001. 00000001
11000100. 00000101. 01111011. 11011101
01011101. 00101100. 01111011. 10111000

Explicação

Questão 95 de 200

1

Convert the following IP address: 158.0.147.85 to the binary

Selecione uma das seguintes:

11001100.11000111.11100011. 00001111
01010110. 01111011. 00000001. 00000001
10011110. 00000000. 10010011. 01010101
11000100. 00000101. 01111011. 11011101

Explicação

Questão 96 de 200

1

set of rules that the sending of rules that the sending program must follow so that the Internecan deliver the data to the destination program is called

Selecione uma das seguintes:

Application Programming Interface (API)
DNS domain name system
Internet transport-layer protocol (TCP or UDP)
Encapsulation

Explicação

Questão 97 de 200

1

Below provided a typical HTTP response message. Let’s take a careful look at this response message
What three sections has HTTP response message?

Selecione uma das seguintes:

What three sections has HTTP response message?
header lines, entity body, and then the URL structure.
an initial status line, entity body, conclusion.
an initial status line, six header lines, and then the entity body.
header lines, entity body, and then the response

Explicação

Questão 98 de 200

1

Below provided a typical HTTP response message. Let’s take a careful look at this response message. It has three sections:
an initial status line, six header lines, and then the entity body
The entity body is the meat of the message—it contains.

Selecione uma das seguintes:

the information about receiver
the status line indicates that the server is using HTTP/1.1 and that everything is OK
the information about all the destination of packet
the requested object itself (represented by data data data data data)

Explicação

Questão 99 de 200

1

Below provided a typical HTTP response message. Let’s take a careful look at this response message. It has three sections: an initial status line, six header lines, and then the entity body
In this example, the status line.

Selecione uma das seguintes:

In this example, the status line.
has the information about receiver
has the requested object itself (represented by data data data data data …)
has the information about all the destination of packet
indicates that the server is using HTTP/1.1 and that everything is OK

Explicação

Questão 100 de 200

1

How does an operating system identify the application to which data coming in from the network should be relayed

Selecione uma das seguintes:

By the protocol with which the data was sent
Only one application at a time is given access to the network.
By the port number carried by the transport protocol
By the file extension of the data

Explicação

Questão 101 de 200

1

The IP address space is organized in a hierarchy (I) to make the routing task more scalable, (II) to decrease inefficient fragmentation of the address space (III) to give institutions managing local-area networks autonomous control over the assignment of addresses to computers

Selecione uma das seguintes:

I and III only
II only
none
I only

Explicação

Questão 102 de 200

1

Which of the following protocols are essential to the existence of the Traceroute tool? 1 IP, 2 ICMP, 3 TCP

Selecione uma das seguintes:

I and III only
II only
II and III only
I only

Explicação

Questão 103 de 200

1

A difference between routers and switches is that

Selecione uma das seguintes:

switches connect only to hosts, whereas routers connect networks
switches hold IP routing tables only for only local subnets
routers parse, process, and modify IP headers
routers perform the same function as switches but the two are marketed in very different way

Explicação

Questão 104 de 200

1

At which of the following layers of the OSI protocol stack can the Internet Control Message Protocol be implement. 1Network, 2transport, 3Data link

Selecione uma das seguintes:

I or II
I only
II only
III only

Explicação

Questão 105 de 200

1

How to understand the connection-oriented protocol?

Selecione uma das seguintes:

means that before the client and server can start to send data to each other, they first need to handshake and establish a TCP connection
means that provide an application with one or more security services can also provide timing guarantees
offers a different set of services to the invoking applications

Explicação

Questão 106 de 200

1

Layers four and five of the Internet protocol stack are implemented in the end systems but not in the routers in the network core

Selecione uma das opções:

VERDADEIRO
FALSO

Explicação

Questão 107 de 200

1

Twisted-pair cooper wire is no longer present in computer networks

Selecione uma das opções:

VERDADEIRO
FALSO

Explicação

Questão 108 de 200

1

Two packets A and B are sent in that order through a connectionless communication network. They will arrive at the destination

Selecione uma das seguintes:

in any order, after possibly having traversed different routes.
in the order A-B, after having traversed the same route.
in any order, after having traversed the same route.
in the order A-B, after possibly having traversed different routes

Explicação

Questão 109 de 200

1

Compared to the wired transmission, wireless transmission typically has _ attenuation and _ maximum distance

Selecione uma das seguintes:

higher, longer
lower, shorter
lower, longer
higher, shorter

Explicação

Questão 110 de 200

1

Which of the following features of Ethernet has not remained constant since the advent of the technology?

Selecione uma das seguintes:

Protocol header format
Protocol addressing
Use of CSMA-CD control
Transmission bandwidth

Explicação

Questão 111 de 200

1

Which of the following internet applications typically transmit(s) packets over Transmission Control Protocol (TCP)? I.FTP client II.Audio streaming III.Web browser

Selecione uma das seguintes:

I, II, and III
II only
I and II only
I and III only

Explicação

Questão 112 de 200

1

In order to maintain network stability while Transmission Control Protocol (TCP) probes for additional bandwidth, rate increases are _, and rate decreases are _

Selecione uma das seguintes:

multiplicative, additive
additive, additive
multiplicative, multiplicative
additive, multiplicative

Explicação

Questão 113 de 200

1

Network clients use well-known _____ numbers to contact well-defined network services, such as Telnet and DNS servers

Selecione uma das seguintes:

accept
connect
listen
port

Explicação

Questão 114 de 200

1

Multicast communication generally refers to data that is

Selecione uma das seguintes:

sent from several hosts to one host simultaneously
relayed through multiple routers
relayed through multiple bridges
sent from one host to several hosts simultaneously

Explicação

Questão 115 de 200

1

The Internet Protocol (IP) defines the _____ layer of the Internet protocol stack

Selecione uma das seguintes:

application
transport
physical
network

Explicação

Questão 116 de 200

1

The term packetization refers to the process of

Selecione uma das seguintes:

reassembling network packets for consumption by an application
using a digital instead of an analog transmission medium
using an analog instead of a digital transmission medium
splitting a message into fragments for network transmission

Explicação

Questão 117 de 200

1

Which of the following statements is (are) true of network protocols?\n I.A protocol is a set of rules that facilitate communication among network applications.\n II.Only a single protocol may govern any transmission

Selecione uma das seguintes:

II only
I and II
None
I only

Explicação

Questão 118 de 200

1

Which of the following is a protocol used for communication between a web server and a web browser?

Selecione uma das seguintes:

FTP
Telnet
World Wide Web (www)
HTTP

Explicação

Questão 119 de 200

1

Which of the following is a disadvantage of connection-based protocols?

Selecione uma das seguintes:

Unreliable connections
High error rates
Small MTU sizes
High startup costs

Explicação

Questão 120 de 200

1

On a network, the term authentication typically refers to the process of

Selecione uma das seguintes:

ensuring that users remain anonymous
ensuring that packets sent through the Internet cannot be intercepted
computing the checksum of packets
verifying the identity of a sender or receiver

Explicação

Questão 121 de 200

1

Which of the following is the network-layer protocol of the Internet?

Selecione uma das seguintes:

HTTP
Telnet
Ethernet
IP

Explicação

Questão 122 de 200

1

Which of the following was designed to solve the problem of IP address space fragmentation?

Selecione uma das seguintes:

Maximum Transfer Unit
Simple Network Management Protocol
Peering
Classless Inter Domain Routing

Explicação

Questão 123 de 200

1

Which of the following IP header fields provide simple error detection?

Selecione uma das seguintes:

Fragmentation
Time to live
Type of service
Checksum

Explicação

Questão 124 de 200

1

Which of the following maps IP addresses onto datalink addresses?

Selecione uma das seguintes:

Domain Name System (DNS)
Simple Network Management Protocol (SNMP)
Classless Inter Domain Routing (CIDR)
Address Resolution Protocol (ARP)

Explicação

Questão 125 de 200

1

Consider an application running on host cs.cmu.edu that wants to send a packet to host ee.cmu.edu. Assuming no information is cached, the send request on cs.cmu.edu will cause which of the following events to happen first?

Selecione uma das seguintes:

An ARP lookup
The packet is sent to the first router.
Host cs.cmu.edu performs an SNMP server query.
A DNS lookup

Explicação

Questão 126 de 200

1

Which of the following can be used by a router to report a dropped packet to the packet's sender?

Selecione uma das seguintes:

Simple Network Management Protocol (SNMP)
Border Gateway Protocol (BGP)
Dynamic Host Configuration Protocol (DHCP)
Internet Control Message Protocol (ICMP)

Explicação

Questão 127 de 200

1

Which of the following IP header fields is designed to prevent a packet from remaining indefinitely in a routing loop?

Selecione uma das seguintes:

Checksum
Length
Fragmentation
Time to live

Explicação

Questão 128 de 200

1

Which of the following allows a host to be assigned an IP address automatically?

Selecione uma das seguintes:

The simple network management protocol (SNMP)
The domain name system (DNS)
The address resolution protocol (ARP)
The dynamic host configuration protocol (DHCP)

Explicação

Questão 129 de 200

1

Which of the following network exploration tools can be used to determine information about possible paths between one network host and another?

Selecione uma das seguintes:

Ping
Netstat
Nslookup
Traceroute

Explicação

Questão 130 de 200

1

The time required to examine the packet's header and determine where to direct the packet is part of the

Selecione uma das seguintes:

Processing delay
Queuing delay
Transmission delay
Propagation delay

Explicação

Questão 131 de 200

1

How we call the delay, when packet waits to be transmitted onto the link

Selecione uma das seguintes:

Processing delay
Queuing delay
Transmission delay
Propagation delay

Explicação

Questão 132 de 200

1

This is the amount of time required to push all of the packet's bits into the link

Selecione uma das seguintes:

Processing delay
Queuing delay
Transmission delay
Propagation delay

Explicação

Questão 133 de 200

1

The protocols of the various layers are called ___________

Selecione uma das seguintes:

protocol stack
protocol layers
protocol group
protocol models

Explicação

Questão 134 de 200

1

Which of the following OSI layers converts the ones and zeroes to electrical signals and places these signals on the cable?

Selecione uma das seguintes:

Physical layer
Transport layer
Network layer
Application laye

Explicação

Questão 135 de 200

1

Which of the following is most likely to be a MAC address assigned to a NIC?

Selecione uma das seguintes:

192.168.1.121
24.17.232.75
23.4F.17.8A.4C.10
713.555.1212

Explicação

Questão 136 de 200

1

Which layer of the TCP/IP model involves routing?

Selecione uma das seguintes:

Physical layer
Transport layer
Application layer
Network layer

Explicação

Questão 137 de 200

1

How much data can a typical frame contain?

Selecione uma das seguintes:

500 bytes
1500 bytes
1500 bits
1 megabyte

Explicação

Questão 138 de 200

1

Which of the following best describes an IP address?

Selecione uma das seguintes:

A unique dotted decimal notation burned into every NIC
A unique 48-bit identifying number burned into every NIC
A dotted decimal notation assigned to a NIC by software
A 48-bit identifying number assigned to a NIC by software

Explicação

Questão 139 de 200

1

Andalyn says complete 48-bit MAC addresses are allocated to NIC manufacturers from the IEEE. Buster says the IEEE only assigns the first 24 bits to manufacturers. Carlos says the IEEE assigns only the last 24 bits to manufacturers. Who is correct?

Selecione uma das seguintes:

Only Andalyn is correct.
Only Buster is correct.
Only Carlos is correct.
No one is correct

Explicação

Questão 140 de 200

1

Host A is sending host B a large file over a TCP connection. Assume host B has no data to send to A. Host B will not send acknowledgements to host A because host B cannot piggyback the acknowledgement on data

Selecione uma das opções:

VERDADEIRO
FALSO

Explicação

Questão 141 de 200

1

A channel partitioning protocol has which of the following characteristics

Selecione uma das seguintes:

there is no master node
it does not generate collisions
all transmitting nodes get the same amount of bandwidth
all of the above

Explicação

Questão 142 de 200

1

Ethernet provides which of the following services to the network layer

Selecione uma das seguintes:

flow control
error detection
reliable data transferreliable data transfer
all of the above

Explicação

Questão 143 de 200

1

Each LAN adapter has a unique LAN address

Selecione uma das opções:

VERDADEIRO
FALSO

Explicação

Questão 144 de 200

1

A channel partitioning has which of the following characteristics

Selecione uma das seguintes:

there is no master node
it does not generate collisions
transmitting nodes get the same amount of bandwidth
all

Explicação

Questão 145 de 200

1

IEEE standard ethernet CSMA/CD provides which of the following services to the network layer?

Selecione uma das seguintes:

reliable data transfer
error detection
error correction
all

Explicação

Questão 146 de 200

1

Before sending a packet into a datagram network, the source must determine all of the links that packet will traverse between source and destination

Selecione uma das opções:

VERDADEIRO
FALSO

Explicação

Questão 147 de 200

1

The Session layer communicates with which other layers

Selecione uma das seguintes:

Application and Transport
Transport and Network
Transport and Presentation
Transport, Presentation and Network

Explicação

Questão 148 de 200

1

application layer data is

Selecione uma das seguintes:

message
frame
datagram
data
segment

Explicação

Questão 149 de 200

1

Transport layer data is

Selecione uma das seguintes:

message
frame
data
datagram
segment

Explicação

Questão 150 de 200

1

Network layer data is

Selecione uma das seguintes:

message
frame
datagram
segment
data

Explicação

Questão 151 de 200

1

Link layer data is

Selecione uma das seguintes:

message
frame
datagram
data
segment

Explicação

Questão 152 de 200

1

HTTP persistent connection - multiple objects can be sent over single TCP connection between client, server

Selecione uma das opções:

VERDADEIRO
FALSO

Explicação

Questão 153 de 200

1

HTTP non- persistent connection - multiple objects can be sent over single TCP connection between client, server

Selecione uma das opções:

VERDADEIRO
FALSO

Explicação

Questão 154 de 200

1

SMTP is used to

Selecione uma das seguintes:

to transfer messages from one mail server to another
to transfer messages from one mail server to another user agent
to define the format of message headers
to transfer messages from one user to another

Explicação

Questão 155 de 200

1

The transmission of high-quality, interactive voice and video over the current Internet is difficult because today's Internet

Selecione uma das seguintes:

does not really have sufficient throughput
gives higher priority to bulk data transfers
uses connectionless protocols
is unable to guarantee minimum throughput or maximum latency for a given connection

Explicação

Questão 156 de 200

1

The throughput of a network link for an HTTP session is measured in two ways. Measurement A is the total amount of data received by the browser, divided by the duration of the session. Measurement B is the total amount of data received by the operating system on behalf of the browser, divided by the duration of the session. Which of the following statements about A and B is true?

Selecione uma das seguintes:

B is smaller than A
A is smaller than B
B is equal to A
B and A are not related

Explicação

Questão 157 de 200

1

Ethernet (IEEE 802.3) is an example of

Selecione uma das seguintes:

a standard developed by the International Telecommunications Union
a successful example of the Internet's strategy of developing standards through "rough consensus and running code"
a de facto standard later developed into a de jure standard
an a priori standard

Explicação

Questão 158 de 200

1

A packet with no data is sent from host A to host B on an otherwise idle network. The packet is found to have taken 35 milliseconds to reach B. The incremental overhead to send an additional byte (usually called the "throughput") is estimated to be five microseconds by repeatedly measuring the transmission times of long packets. Approximately, how long will an eight Kbytes (8192 bytes) packet take to reach B when sent from A?

Selecione uma das seguintes:

cannot be determined from the information given
55 milliseconds
40 milliseconds
76 milliseconds

Explicação

Questão 159 de 200

1

When the data link layer applies "framing" to the data to be transmitted, it

Selecione uma das seguintes:

cuts out the headers from higher layer protocols before transmission
adds the protocol headers from higher layers to the data before it transmits it
inserts flags to draw attention to high-priority data within a transmission
enhances it with extra data that permits the receiver to synchronize with the sender

Explicação

Questão 160 de 200

1

In a broadcast-based network, longer propagation delays

Selecione uma das seguintes:

destroy the carrier, making it impossible to sense it before transmitting
make it all the more critical to sense the carrier before transmitting
significantly decrease the benefit of sensing the carrier before transmitting
do not affect the cost-benefit trade-off of carrier sensing

Explicação

Questão 161 de 200

1

What is the type of an "8+1" parity code that outputs 100101011?

Selecione uma das seguintes:

Odd Parity
Null Parity
Cannot tell since we do not know which bit is the parity bit
Even Parity

Explicação

Questão 162 de 200

1

A specific CSMA-CD network such as 10-BASET "Ethernet

Selecione uma das seguintes:

has higher cost per node as nodes are added
can connect very distant node
works best for an even number of nodes
suffers performance degradation as nodes are added

Explicação

Questão 163 de 200

1

A university has 20 computers in a laboratory that is currently served by several small 10 Base-T "Ethernet" hubs that are directly connected to each other. The network performance has been found to be lacking, and an upgrade is planned. The computers are identical and place a comparable load on the network that is relatively constant and modest for each computer (in the order of 500 Kbps). What would you suggest for the upgrade?

Selecione uma das seguintes:

A small 10 Base-T switch to connect the existing hub
Replace the hubs with 100 Base-T hub
A new bank of dial-up modems
Replace the hubs with 10 Base-T switches

Explicação

Questão 164 de 200

1

A sender's data link layer uses "bit stuffing" to

Selecione uma das seguintes:

force the receiver to enlarge its flow control window
avoid confusing data bits with control bits
pad the data so that it has an even length for parity calculations
mark the start and the end of a frame

Explicação

Questão 165 de 200

1

The Internet Protocol (IP) is used in the network layer of the Internet. Which service does IP provide to the transport layer?

Selecione uma das seguintes:

Connectionless service via virtual circuits
Connectionless service via datagrams
Connection-oriented service via datagrams
Connection-oriented service via virtual circuits

Explicação

Questão 166 de 200

1

A corporate information systems manager is interested in collecting statistics on the frequency of computer failures within the organization. Most failures result in an automatic reboot, so the failed computer is typically back on the network in less than a minute. The corporate network connects 1,500 computers in far-flung locations to which the average latency of a packet is 40 milliseconds. The manager asks you to write a tool that will collect the times at which failures occurred in which computers. She wants it by tomorrow, so the tool will have to be simple. On which protocol will you base your implementation?

Selecione uma das seguintes:

TCP
SNMP
PLM
ICMP

Explicação

Questão 167 de 200

1

A router is installed to interconnect 4 subnetworks with MTUs of 1024, 2048, 576, and 1556 bytes respectively. Nodes A and B are connected to the first and second subnets, respectively. An application on node A sends a 4096-byte datagram (e.g., using UDP) to an application on node B. How many IP fragments will the router process as a result?

Selecione uma das seguintes:

4
5
1
2

Explicação

Questão 168 de 200

1

The network interface card of a Web server that you manage has developed sporadic problems. You measure the packet loss rate from your desktop computer and immediately decide to replace the network card. After this simple operation, the Web server successfully rejoins the network, as confirmed by your officemate using her desktop computer. You eagerly go to your desktop to measure the improvement, but find instead that the Web server is not responding to any of your packets. What is your diagnosis?

Selecione uma das seguintes:

The new network card does not work.
Your desktop computer is still trying to contact the server's old network card.
Your desktop computer's network card does not work.
The Domain Name System (DNS) has not yet updated its entry for the Web server.

Explicação

Questão 169 de 200

1

In contrast to standards developed by traditional standards organizations like the International
Telecommunications Union (ITU) or the International Standards Organization (ISO), standards developed by the Internet Engineering Task Force (IETF) can be

Selecione uma das seguintes:

developed in secret by the members of the IETF until the standards mature sufficiently to withstand public criticism
modified arbitrarily by the Advance Research projects Agency (ARPA) of the United States Department of Defense, which originally developed the Internet
applied before they have been embodied in working implementations, in order not to delay progress
extensively critiqued and modified by individuals, without requiring them to have special membership status

Explicação

Questão 170 de 200

1

there are transport service requirements, for which of the following applications these requirements are demanded: no data loss, elastic throughput, and not time sensitive

Selecione uma das seguintes:

e-mail
real time audio/video
text messaging
games

Explicação

Questão 171 de 200

1

there are transport service requirements, for which of the following applications these requirements are demanded: no data loss, elastic throughput, and not time sensitive

Selecione uma das seguintes:

web documents
real time audio/video
text messaging
games

Explicação

Questão 172 de 200

1

reliable transport between sending and receiving process refers to (protocol type)?

Selecione uma ou mais das seguintes:

TCP
Transport control protocol
TCP service
Вы должны будете написать это поэтому запомните хоть один вариант

Explicação

Questão 173 de 200

1

TP client contacts FTP server at port ______, using TCP

Selecione uma ou mais das seguintes:

21
twenty one
Запомни (хоть один вариант) так как тебе нужно будет это написать

Explicação

Questão 174 de 200

1

331 Username OK, password required – status code refers to (protocol type)?

Selecione uma ou mais das seguintes:

Запомни (хоть один вариант) так как тебе нужно будет это написать
FTP
File transport protocol

Explicação

Questão 175 de 200

1

e-mails use ______________ protocol for sending messages

Selecione uma das seguintes:

SMTP
FTP
HTTP
MIME

Explicação

Questão 176 de 200

1

IMAP stands for

Selecione uma ou mais das seguintes:

Internet Mail Access protocol
Запомни тебе надо это написать

Explicação

Questão 177 de 200

1

POP stands for

Selecione uma das seguintes:

Запомни тебе надо это написать
post office protocol

Explicação

Questão 178 de 200

1

Which of the following statements are true about the TCP service model?

Selecione uma das seguintes:

TCP uses a checksum to determine if the application data follows the right syntax
TCP delivers a stream of bytes from one end to the other, reliably and in-sequence, on behalf of an application
Because TCP encodes data with enough information to correct errors, it never needs to retransmit missing segments
Because TCP cannot trust the IP layer to format packets correctly, it must include the destination IP address in the TCP header
TCP is responsible for providing reliable, in-sequence end-to-end delivery of data between applications.

Explicação

Questão 179 de 200

1

Which of the following are direct consequences of this design choice?

Selecione uma das seguintes:

TCP is self-contained with sufficient addressing information in its header that it does not need the IP layer, or any other layer beneath it to deliver data to the far end
TCP will retransmit missing data even if the application can not use it - for example, in Internet telephony a late arriving retransmission may arrive too late to be useful
TCP can only work correctly if the layer below it also delivers data reliably and in sequence
TCP requires no connection state to be established prior to the end points communicating

Explicação

Questão 180 de 200

1

The _______ layer lies between the network layer and the application layer.

Selecione uma das seguintes:

physical
data link
transport
none

Explicação

Questão 181 de 200

1

Which of the following is an application layer service?

Selecione uma das seguintes:

remote log-in
mail service
file transfer and access
all

Explicação

Questão 182 de 200

1

The_________ layer is responsible for the delivery of a message from one process to another

Selecione uma das seguintes:

physical
data link
transport
network

Explicação

Questão 183 de 200

1

The Internetworking Protocol (IP) is a ________ protocol

Selecione uma das seguintes:

reliable
connectionless
connection oriented
none

Explicação

Questão 184 de 200

1

____ is a process-to-process protocol that adds only port addresses, checksum error control, and length information to the data from the upper layer

Selecione uma das seguintes:

TCP
UDP
IP
HTTP

Explicação

Questão 185 de 200

1

__________provides full transport layer services to applications

Selecione uma das seguintes:

TCP
UDP
IP
HTTP

Explicação

Questão 186 de 200

1

Translation of a domain name into an address called

Selecione uma das seguintes:

name resolution
time needed to transmit L-bit packet into link = L (bits) / R (bits/sec)
bandwidth
packet transmission delay
rate
DNS

Explicação

Questão 187 de 200

1

In a link layer hosts and router are called

Selecione uma das seguintes:

Node
Frame
Protocol
Server

Explicação

Questão 188 de 200

1

Link layer encapsulates datagrad in a

Selecione uma das seguintes:

Node
Frame
Protocol
Server

Explicação

Questão 189 de 200

1

The FDDI protocol is based on

Selecione uma das seguintes:

The token ring protocol
Transmission control Protocol
File Transfer Protocol
HTTP

Explicação

Questão 190 de 200

1

Registered users may look up all meetings in their agenda in a given interval of time

Selecione uma das seguintes:

Querying Meetings
User Registration
Adding Meetings
Deleting Meetings
Clearing Meetings

Explicação

Questão 191 de 200

1

Dividing the network into smaller portions called

Selecione uma das seguintes:

Subnet
Subnet Mask
Bits
IP

Explicação

Questão 192 de 200

1

Identify the incorrect statement

Selecione uma das seguintes:

FTP sends its control information in-band
FTP stands for File Transfer Protocol
FTP uses two parallel TCP connections
FTP sends exactly one file over the data connection

Explicação

Questão 193 de 200

1

Find the FTP reply whose message is wrongly matched

Selecione uma das seguintes:

331 – Username OK, password required
425 – Can’t open data connection
452 – Error writing file
452 – Can’t open data connection

Explicação

Questão 194 de 200

1

Typically the TCP port used by SMTP is

Selecione uma das seguintes:

25
35
50
15

Explicação

Questão 195 de 200

1

The entire hostname has a maximum of ___characters

Selecione uma das seguintes:

255
127
63
21

Explicação

Questão 196 de 200

1

Which one of the following allows a user at one site to establish a connection to another site and then pass keystrokes from local host to remote host?

Selecione uma das seguintes:

HTTP
FTP
Telnet
TCP

Explicação

Questão 197 de 200

1

All link layer protocols that support IP have the same frame structure (i.e., length of frame, number and length of header fields).

Selecione uma das opções:

VERDADEIRO
FALSO

Explicação

Questão 198 de 200

1

Suppose a network manager wanted to query the value of the number of TCP segments received by a host running the Microsoft Windows 2000 operating system in a US-based company. What would be the prefix (leading digits) of the MIB variable that should be queried?

Selecione uma ou mais das seguintes:

1.3.6.1.2.1.1
запомни надо будет написать

Explicação

Questão 199 de 200

1

For public-key certification, PGP uses certification authorities.

Selecione uma das opções:

VERDADEIRO
FALSO

Explicação

Questão 200 de 200

1

The 802.11 protocol does not implement collision detection because

Selecione uma ou mais das seguintes:

the adapter would still not be able to detect all collisions due to hidden terminals.
it is costly to build wireless hardware that detects collisions.
collision detection was found to be useless in wired Ethernet.
all of the above

	Criado por Altynay Toiguliyeva mais de 4 anos atrás