Computer Networking Quiz (or) Computer Networking MCQ (Multiple Choice Questions)

1 .

CRC stands for ________

A)

Code Repeat Check

B)

Cyclic Redundancy Check

C)

Cyclic Repeat Check

D)

Code Redundancy Check

Correct Answer : Option (B) : Cyclic Redundancy Check

Explanation : Cyclic Redundancy Check is a code that is added to a data which helps us to identify any error that occurred during the transmission of the data. CRC is only able to detect errors, not correct them. CRC is inserted in the frame trailer.

2 .

Which of the following is the multiple access protocol for channel access control?

A)

CSMA/CD

B)

CSMA/CA

C)

Both CSMA/CD & CSMA/CA

D)

HDLC

Correct Answer : Option (C) : Both CSMA/CD & CSMA/CA

Explanation : In CSMA/CD, it deals with detection of collision after collision has occurred, whereas CSMA/CA deals with preventing collision. CSMA/CD is abbreviation for Carrier Sensing Multiple Access/Collision detection. CSMA/CA is abbreviation for Carrier Sensing Multiple Access/Collision Avoidance. These protocols are used for efficient multiple channel access.

3 .

The technique of temporarily delaying outgoing acknowledgements so that they can be hooked onto the next outgoing data frame is called ______

A)

piggybacking

B)

parity check

C)

fletcher’s checksum

D)

cyclic redundancy check

Correct Answer : Option (A) : piggybacking

Explanation : Piggybacking is a technique in which the acknowledgment is temporarily delayed so as to be hooked with the next outgoing data frame. It saves a lot of channel bandwidth as in non-piggybacking system, some bandwidth is reserved for acknowledgement.

4 .

Transport layer aggregates data from different applications into a single stream before passing it to ______

A)

physical layer

B)

data link layer

C)

network layer

D)

application layer

Correct Answer : Option (C) : network layer

Explanation : The flow of data in the OSI model flows in following manner Application -> Presentation -> Session -> Transport -> Network -> Data Link -> Physical. Each and every layer has its own set of functions and protocols to ensure efficient network performance.

5 .

Which of the following are transport layer protocols used in networking?

A)

TCP and FTP

B)

UDP and HTTP

C)

HTTP and FTP

D)

TCP and UDP

Correct Answer : Option (D) : TCP and UDP

Explanation : Both TCP and UDP are transport layer protocol in networking. TCP is an abbreviation for Transmission Control Protocol and UDP is an abbreviation for User Datagram Protocol. TCP is connection oriented whereas UDP is connectionless.

6 .

Socket-style API for windows is called _______

A)

wins

B)

wsock

C)

sockwi

D)

winsock

Correct Answer : Option (D) : winsock

Explanation : Winsock is a programming interface which deals with input output requests for internet applications in windows OS. It defines how windows network software should access network services.

7 .

Which one of the following is a version of UDP with congestion control?

A)

structured stream transport

B)

datagram congestion control protocol

C)

user congestion control protocol

D)

stream control transmission protocol

Correct Answer : Option (B) : datagram congestion control protocol

Explanation : The datagram congestion control is a transport layer protocol which deals with reliable connection setup, teardown, congestion control, explicit congestion notification, and feature negotiation. It is used in modern day systems where there are really high chances of congestion. The protocol was last updated in the year 2008.

8 .

A _____ is a TCP name for a transport service access point.

A)

port

B)

pipe

C)

node

D)

protocol

Correct Answer : Option (A) : port

Explanation : Just as the IP address identifies the computer, the network port identifies the application or service running on the computer. A port number is 16 bits. The combination of IP address preceded with the port number is called the socket address.

9 .

In virtual circuit network each packet contains ______

A)

Only source address

B)

Only destination address

C)

A short VC number

D)

Full source and destination address

Correct Answer : Option (C) : A short VC number

Explanation : A short VC number also called as VCID (virtual circuit identifier) is a type of identifier which is used to distinguish between several virtual circuits in a connection oriented circuit switched network. Each virtual circuit is used to transfer data over a larger packet switched network.

10 .

Which of the following routing algorithms can be used for network layer design?

A)

Distance vector routing

B)

Link state routing

C)

Shortest path algorithm

D)

All of the above

Correct Answer : Option (D) : All of the above

Explanation : The routing algorithm is what decides where a packet should go next. There are several routing techniques like shortest path algorithm, static and dynamic routing, decentralized routing, distance vector routing, link state routing, Hierarchical routing etc. The routing algorithms go hand in hand with the operations of all the routers in the networks. The routers are the main participants in these algorithms.