Networking | Quiz

Question 1 of 200

1

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

Select one of the following:

Rejected
Accepted
Interpreted
Interpreted incorrectly

Explanation

Question 2 of 200

1

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

Select one of the following:

Station
Link
Node
Protocol

Explanation

Question 3 of 200

1

Header of datagram in IPv4 has

Select one of the following:

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

Explanation

Question 4 of 200

1

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

Select one of the following:

TCP protocols
CDM protocols
ATM protocols
IEEE protocols

Explanation

Question 5 of 200

1

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

Select one of the following:

Record protocol
Record Data
Record Route
Record Header

Explanation

Question 6 of 200

1

Internet has chosen datagram approach to switching in the

Select one of the following:

Data Link Layer
Network Layer
Physical Layer
Presentation Layer

Explanation

Question 7 of 200

1

In IPv4 protocol, each datagram is handled

Select one of the following:

Independently
Dependently
Priority basis
Systematically

Explanation

Question 8 of 200

1

CCT stands fo

Select one of the following:

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

Explanation

Question 9 of 200

1

Communication between a computer and a keyboard involves ______________ transmission

Select one of the following:

Automatic
Half-duplex
Full-duplex
Single direction

Explanation

Question 10 of 200

1

Three or more devices share a link in ________ connection

Select one of the following:

Unipoint
Multipoint
Point to point
None

Explanation

Question 11 of 200

1

In asynchronous serial communication the physical layer provide

Select one of the following:

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

Explanation

Question 12 of 200

1

The physical layer is responsible for

Select one of the following:

line coding
channel coding
modulation
all of the mentioned

Explanation

Question 13 of 200

1

A single channel is shared by multiple signals by

Select one of the following:

analog modulation
digital modulation
multiplexing
none

Explanation

Question 14 of 200

1

Wireless transmission can be done via

Select one of the following:

radio waves
microwaves
infrared
all of the mentioned

Explanation

Question 15 of 200

1

Which is not a application layer protocol?

Select one of the following:

HTTP
SMTP
FTP
TCP

Explanation

Question 16 of 200

1

The packet of information at the application layer is called __________

Select one of the following:

Packet
Message
Segment
Frame

Explanation

Question 17 of 200

1

Which one of the following is an architecture paradigms?

Select one of the following:

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

Explanation

Question 18 of 200

1

Application layer offers _______ service

Select one of the following:

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

Explanation

Question 19 of 200

1

E-mail is _________

Select one of the following:

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

Explanation

Question 20 of 200

1

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

Select one of the following:

IP
MAC
Port
None

Explanation

Question 21 of 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

Select one of the following:

True
False

Explanation

Question 22 of 200

1

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

Select one of the following:

True
False

Explanation

Question 23 of 200

1

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

Select one of the following:

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.

Explanation

Question 24 of 200

1

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

Select one of the following:

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

Explanation

Question 25 of 200

1

The Internet received its name in the 1980s because:

Select one of the following:

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.

Explanation

Question 26 of 200

1

All store-and-forward networks are

Select one of the following:

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

Explanation

Question 27 of 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?

Select one of the following:

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

Explanation

Question 28 of 200

1

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

Select one of the following:

True
False

Explanation

Question 29 of 200

1

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

Select one of the following:

True
False

Explanation

Question 30 of 200

1

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

Select one of the following:

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

Explanation

Question 31 of 200

1

A browser will generate header lines as a function of

Select one of the following:

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

Explanation

Question 32 of 200

1

SMTP is used to:

Select one of the following:

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.

Explanation

Question 33 of 200

1

DNS resource record has Type=MX. Then:

Select one of the following:

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.

Explanation

Question 34 of 200

1

Local DNS name servers:

Select one of the following:

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

Explanation

Question 35 of 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.

Select one of the following:

True
False

Explanation

Question 36 of 200

1

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

Select one of the following:

True
False

Explanation

Question 37 of 200

1

The TCP segment has a field in its header for RcvWindow

Select one of the following:

True
False

Explanation

Question 38 of 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

Select one of the following:

True
False

Explanation

Question 39 of 200

1

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

Select one of the following:

True
False

Explanation

Question 40 of 200

1

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

Select one of the following:

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

Explanation

Question 41 of 200

1

UDP has which of the following characteristics

Select one of the following:

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

Explanation

Question 42 of 200

1

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

Select one of the following:

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

Explanation

Question 43 of 200

1

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

Select one of the following:

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

Explanation

Question 44 of 200

1

Pipelining requires which of the following

Select one of the following:

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

Explanation

Question 45 of 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

Select one of the following:

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

Explanation

Question 46 of 200

1

Streams are not needed in which of the following programs

Select one of the following:

TCPserver
UDPserver
TCPclient
UDPclient

Explanation

Question 47 of 200

1

For BitTorrent, which of the following is true

Select one of the following:

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

Explanation

Question 48 of 200

1

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

Select one of the following:

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

Explanation

Question 49 of 200

1

TCP applies fast retransmit to a segment when

Select one of the following:

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

Explanation

Question 50 of 200

1

Nmap is often used to

Select one of the following:

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

Explanation

Question 51 of 200

1

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

Select one of the following:

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

Explanation

Question 52 of 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

Select one of the following:

True
False

Explanation

Question 53 of 200

1

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

Select one of the following:

True
False

Explanation

Question 54 of 200

1

A forwarding table is

Select one of the following:

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

Explanation

Question 55 of 200

1

How are routing paths calculated?

Select one of the following:

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

Explanation

Question 56 of 200

1

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

Select one of the following:

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

Explanation

Question 57 of 200

1

Match the following network service to the correct definition

Select one of the following:

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

Explanation

Question 58 of 200

1

An ARP query packet is encapsulated in an IP datagram.

Select one of the following:

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

Explanation

Question 59 of 200

1

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

Select one of the following:

error detection
flow control
reliable data transfer
all of the above

Explanation

Question 60 of 200

1

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

Select one of the following:

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

Explanation

Question 61 of 200

1

A beacon frame sent by an AP includes

Select one of the following:

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

Explanation

Question 62 of 200

1

Packets sent by two stations in 802.11 can collide because

Select one of the following:

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

Explanation

Question 63 of 200

1

An 802.11 frame includes

Select one of the following:

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

Explanation

Question 64 of 200

1

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

Select one of the following:

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

Explanation

Question 65 of 200

1

What is the purpose of the SNMP SetRequest message?

Select one of the following:

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

Explanation

Question 66 of 200

1

What is the purpose of a presentation service?

Select one of the following:

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

Explanation

Question 67 of 200

1

Filtering in a firewall can be based on:

Select one of the following:

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

Explanation

Question 68 of 200

1

How we call the link-layer packets?

Select one of the following:

Frames
Packets
Datagrams
Segment
Message

Explanation

Question 69 of 200

1

What is the segment?

Select one of the following:

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

Explanation

Question 70 of 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

Select one of the following:

Queuing delays
Store-and-forward
Reliable data
Datagram

Explanation

Question 71 of 200

1

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

Select one of the following:

Supercomputer
Data center
Server house
Host center

Explanation

Question 72 of 200

1

Match the following delays to the correct definition

Select one of the following:

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 ))))

Explanation

Question 73 of 200

1

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

Select one of the following:

WWW
HTTP
HTML
None

Explanation

Question 74 of 200

1

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

Select one of the following:

Path
Protocol
Host
None

Explanation

Question 75 of 200

1

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

Select one of the following:

Client; client
Client; sever
Sever; server
None

Explanation

Question 76 of 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

Select one of the following:

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

Explanation

Question 77 of 200

1

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

Select one or more of the following:

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

Explanation

Question 78 of 200

1

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

Select one of the following:

Web cache
Set-cookies
Cookies
Status line

Explanation

Question 79 of 200

1

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

Select one of the following:

Web browser
Client
Root servers
Data center
Proxy server
DNS servers

Explanation

Question 80 of 200

1

How many ports can be per IP address

Select one of the following:

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

Explanation

Question 81 of 200

1

FTP is built on _____ architecture

Select one of the following:

Client-server
P2P
Both of the mentioned
None

Explanation

Question 82 of 200

1

FTP uses _____ parallel TCP connections to transfer a file

Select one of the following:

1
2
3
4

Explanation

Question 83 of 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

Select one of the following:

5
10
2
6

Explanation

Question 84 of 200

1

The password is sent to the server using _____ command

Select one of the following:

PASSWD
PASS
PASSWORD
None

Explanation

Question 85 of 200

1

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

Select one of the following:

RIP
RDT
ARP
TTL
RTT

Explanation

Question 86 of 200

1

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

Select one of the following:

A hub
A host
Switch
Router

Explanation

Question 87 of 200

1

Define to which level of the network protocols are belong to

Select one of the following:

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

Explanation

Question 88 of 200

1

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

Select one of the following:

Virtual circuit
A global routing
Forwarding
None

Explanation

Question 89 of 200

1

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

Select one of the following:

Datagram network
Virtual-circuit networks
Network
None

Explanation

Question 90 of 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

Select one of the following:

Virtual-circuit networks
Network
Datagram network
None

Explanation

Question 91 of 200

1

Determine the correct class of the following IP address: 93.44.123.184

Select one of the following:

A
B
C
D
E

Explanation

Question 92 of 200

1

Determine the correct class of the following IP address: 160.23.244.224

Select one of the following:

A
B
C
D
E

Explanation

Question 93 of 200

1

Convert the following IP address: 192.224.224.15 to the binary

Select one of the following:

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

Explanation

Question 94 of 200

1

Convert the following IP address: 93.44.123.184 to the binary

Select one of the following:

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

Explanation

Question 95 of 200

1

Convert the following IP address: 158.0.147.85 to the binary

Select one of the following:

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

Explanation

Question 96 of 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

Select one of the following:

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

Explanation

Question 97 of 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?

Select one of the following:

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

Explanation

Question 98 of 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.

Select one of the following:

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)

Explanation

Question 99 of 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.

Select one of the following:

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

Explanation

Question 100 of 200

1

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

Select one of the following:

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

Explanation

Question 101 of 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

Select one of the following:

I and III only
II only
none
I only

Explanation

Question 102 of 200

1

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

Select one of the following:

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

Explanation

Question 103 of 200

1

A difference between routers and switches is that

Select one of the following:

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

Explanation

Question 104 of 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

Select one of the following:

I or II
I only
II only
III only

Explanation

Question 105 of 200

1

How to understand the connection-oriented protocol?

Select one of the following:

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

Explanation

Question 106 of 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

Select one of the following:

True
False

Explanation

Question 107 of 200

1

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

Select one of the following:

True
False

Explanation

Question 108 of 200

1

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

Select one of the following:

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

Explanation

Question 109 of 200

1

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

Select one of the following:

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

Explanation

Question 110 of 200

1

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

Select one of the following:

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

Explanation

Question 111 of 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

Select one of the following:

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

Explanation

Question 112 of 200

1

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

Select one of the following:

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

Explanation

Question 113 of 200

1

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

Select one of the following:

accept
connect
listen
port

Explanation

Question 114 of 200

1

Multicast communication generally refers to data that is

Select one of the following:

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

Explanation

Question 115 of 200

1

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

Select one of the following:

application
transport
physical
network

Explanation

Question 116 of 200

1

The term packetization refers to the process of

Select one of the following:

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

Explanation

Question 117 of 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

Select one of the following:

II only
I and II
None
I only

Explanation

Question 118 of 200

1

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

Select one of the following:

FTP
Telnet
World Wide Web (www)
HTTP

Explanation

Question 119 of 200

1

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

Select one of the following:

Unreliable connections
High error rates
Small MTU sizes
High startup costs

Explanation

Question 120 of 200

1

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

Select one of the following:

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

Explanation

Question 121 of 200

1

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

Select one of the following:

HTTP
Telnet
Ethernet
IP

Explanation

Question 122 of 200

1

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

Select one of the following:

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

Explanation

Question 123 of 200

1

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

Select one of the following:

Fragmentation
Time to live
Type of service
Checksum

Explanation

Question 124 of 200

1

Which of the following maps IP addresses onto datalink addresses?

Select one of the following:

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

Explanation

Question 125 of 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?

Select one of the following:

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

Explanation

Question 126 of 200

1

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

Select one of the following:

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

Explanation

Question 127 of 200

1

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

Select one of the following:

Checksum
Length
Fragmentation
Time to live

Explanation

Question 128 of 200

1

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

Select one of the following:

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

Explanation

Question 129 of 200

1

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

Select one of the following:

Ping
Netstat
Nslookup
Traceroute

Explanation

Question 130 of 200

1

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

Select one of the following:

Processing delay
Queuing delay
Transmission delay
Propagation delay

Explanation

Question 131 of 200

1

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

Select one of the following:

Processing delay
Queuing delay
Transmission delay
Propagation delay

Explanation

Question 132 of 200

1

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

Select one of the following:

Processing delay
Queuing delay
Transmission delay
Propagation delay

Explanation

Question 133 of 200

1

The protocols of the various layers are called ___________

Select one of the following:

protocol stack
protocol layers
protocol group
protocol models

Explanation

Question 134 of 200

1

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

Select one of the following:

Physical layer
Transport layer
Network layer
Application laye

Explanation

Question 135 of 200

1

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

Select one of the following:

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

Explanation

Question 136 of 200

1

Which layer of the TCP/IP model involves routing?

Select one of the following:

Physical layer
Transport layer
Application layer
Network layer

Explanation

Question 137 of 200

1

How much data can a typical frame contain?

Select one of the following:

500 bytes
1500 bytes
1500 bits
1 megabyte

Explanation

Question 138 of 200

1

Which of the following best describes an IP address?

Select one of the following:

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

Explanation

Question 139 of 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?

Select one of the following:

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

Explanation

Question 140 of 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

Select one of the following:

True
False

Explanation

Question 141 of 200

1

A channel partitioning protocol has which of the following characteristics

Select one of the following:

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

Explanation

Question 142 of 200

1

Ethernet provides which of the following services to the network layer

Select one of the following:

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

Explanation

Question 143 of 200

1

Each LAN adapter has a unique LAN address

Select one of the following:

True
False

Explanation

Question 144 of 200

1

A channel partitioning has which of the following characteristics

Select one of the following:

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

Explanation

Question 145 of 200

1

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

Select one of the following:

reliable data transfer
error detection
error correction
all

Explanation

Question 146 of 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

Select one of the following:

True
False

Explanation

Question 147 of 200

1

The Session layer communicates with which other layers

Select one of the following:

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

Explanation

Question 148 of 200

1

application layer data is

Select one of the following:

message
frame
datagram
data
segment

Explanation

Question 149 of 200

1

Transport layer data is

Select one of the following:

message
frame
data
datagram
segment

Explanation

Question 150 of 200

1

Network layer data is

Select one of the following:

message
frame
datagram
segment
data

Explanation

Question 151 of 200

1

Link layer data is

Select one of the following:

message
frame
datagram
data
segment

Explanation

Question 152 of 200

1

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

Select one of the following:

True
False

Explanation

Question 153 of 200

1

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

Select one of the following:

True
False

Explanation

Question 154 of 200

1

SMTP is used to

Select one of the following:

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

Explanation

Question 155 of 200

1

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

Select one of the following:

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

Explanation

Question 156 of 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?

Select one of the following:

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

Explanation

Question 157 of 200

1

Ethernet (IEEE 802.3) is an example of

Select one of the following:

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

Explanation

Question 158 of 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?

Select one of the following:

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

Explanation

Question 159 of 200

1

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

Select one of the following:

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

Explanation

Question 160 of 200

1

In a broadcast-based network, longer propagation delays

Select one of the following:

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

Explanation

Question 161 of 200

1

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

Select one of the following:

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

Explanation

Question 162 of 200

1

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

Select one of the following:

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

Explanation

Question 163 of 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?

Select one of the following:

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

Explanation

Question 164 of 200

1

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

Select one of the following:

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

Explanation

Question 165 of 200

1

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

Select one of the following:

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

Explanation

Question 166 of 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?

Select one of the following:

TCP
SNMP
PLM
ICMP

Explanation

Question 167 of 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?

Select one of the following:

4
5
1
2

Explanation

Question 168 of 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?

Select one of the following:

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.

Explanation

Question 169 of 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

Select one of the following:

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

Explanation

Question 170 of 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

Select one of the following:

e-mail
real time audio/video
text messaging
games

Explanation

Question 171 of 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

Select one of the following:

web documents
real time audio/video
text messaging
games

Explanation

Question 172 of 200

1

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

Select one or more of the following:

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

Explanation

Question 173 of 200

1

TP client contacts FTP server at port ______, using TCP

Select one or more of the following:

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

Explanation

Question 174 of 200

1

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

Select one or more of the following:

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

Explanation

Question 175 of 200

1

e-mails use ______________ protocol for sending messages

Select one of the following:

SMTP
FTP
HTTP
MIME

Explanation

Question 176 of 200

1

IMAP stands for

Select one or more of the following:

Internet Mail Access protocol
Запомни тебе надо это написать

Explanation

Question 177 of 200

1

POP stands for

Select one of the following:

Запомни тебе надо это написать
post office protocol

Explanation

Question 178 of 200

1

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

Select one of the following:

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.

Explanation

Question 179 of 200

1

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

Select one of the following:

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

Explanation

Question 180 of 200

1

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

Select one of the following:

physical
data link
transport
none

Explanation

Question 181 of 200

1

Which of the following is an application layer service?

Select one of the following:

remote log-in
mail service
file transfer and access
all

Explanation

Question 182 of 200

1

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

Select one of the following:

physical
data link
transport
network

Explanation

Question 183 of 200

1

The Internetworking Protocol (IP) is a ________ protocol

Select one of the following:

reliable
connectionless
connection oriented
none

Explanation

Question 184 of 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

Select one of the following:

TCP
UDP
IP
HTTP

Explanation

Question 185 of 200

1

__________provides full transport layer services to applications

Select one of the following:

TCP
UDP
IP
HTTP

Explanation

Question 186 of 200

1

Translation of a domain name into an address called

Select one of the following:

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

Explanation

Question 187 of 200

1

In a link layer hosts and router are called

Select one of the following:

Node
Frame
Protocol
Server

Explanation

Question 188 of 200

1

Link layer encapsulates datagrad in a

Select one of the following:

Node
Frame
Protocol
Server

Explanation

Question 189 of 200

1

The FDDI protocol is based on

Select one of the following:

The token ring protocol
Transmission control Protocol
File Transfer Protocol
HTTP

Explanation

Question 190 of 200

1

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

Select one of the following:

Querying Meetings
User Registration
Adding Meetings
Deleting Meetings
Clearing Meetings

Explanation

Question 191 of 200

1

Dividing the network into smaller portions called

Select one of the following:

Subnet
Subnet Mask
Bits
IP

Explanation

Question 192 of 200

1

Identify the incorrect statement

Select one of the following:

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

Explanation

Question 193 of 200

1

Find the FTP reply whose message is wrongly matched

Select one of the following:

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

Explanation

Question 194 of 200

1

Typically the TCP port used by SMTP is

Select one of the following:

25
35
50
15

Explanation

Question 195 of 200

1

The entire hostname has a maximum of ___characters

Select one of the following:

255
127
63
21

Explanation

Question 196 of 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?

Select one of the following:

HTTP
FTP
Telnet
TCP

Explanation

Question 197 of 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).

Select one of the following:

True
False

Explanation

Question 198 of 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?

Select one or more of the following:

1.3.6.1.2.1.1
запомни надо будет написать

Explanation

Question 199 of 200

1

For public-key certification, PGP uses certification authorities.

Select one of the following:

True
False

Explanation

Question 200 of 200

1

The 802.11 protocol does not implement collision detection because

Select one or more of the following:

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

	Created by Altynay Toiguliyeva almost 5 years ago