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

1 .

In the slow-start algorithm, the size of the congestion window increases __________ until it reaches a threshold.

A)

suddenly

B)

additively

C)

multiplicatively

D)

exponentially

Correct Answer : Option (D) : exponentially

Explanation : In slow-start algorithm, the size of the congestion window increases exponentially until it reaches a threshold. When it reaches the threshold, it stops increasing and continues sending packets through the threshold window thus preventing congestion.

2 .

ATM and frame relay are ________

A)

datagram networks

B)

virtual public networks

C)

virtual circuit networks

D)

virtual private networks

Correct Answer : Option (C) : virtual circuit networks

Explanation : ATM and frame relay are transmission modes in which information is transferred through electric circuit layer as packets. ATM has fixed packet size and frame relay has variable packet size.

3 .

ATM uses _______

A)

asynchronous space division multiplexing

B)

asynchronous time division multiplexing

C)

asynchronous frequency division multiplexing

D)

asynchronous amplitude division multiplexing

Correct Answer : Option (B) : asynchronous time division multiplexing

Explanation : ATM uses a constant data stream consisting of transmission cells to transmit information in a fixed division of time. The packet size remains fixed.

4 .

Frame relay has error detection at the ______

A)

network layer

B)

physical layer

C)

data link layer

D)

transport layer

Correct Answer : Option (C) : data link layer

Explanation : The Frame Relay header contains an 8-bit Header Error Control field (HEC). The HEC field contains an 8-bit CRC which is used for error control.

5 .

What is FRAD in frame relay network?

A)

FRAD is used for error recovery

B)

FRAD is used for error detection

C)

FRAD is used for modulation and demodulation

D)

FRAD assembles and disassembles the frames coming from other protocols

Correct Answer : Option (D) : FRAD assembles and disassembles the frames coming from other protocols

Explanation : FRAD stands for Frame Relay Assembler/Disassembler. It converts packets into frames that can be transmitted over Frame Relay Networks. It operates at the physical layer.

6 .

The address that is unique in the scope of the network or internationally if the network is part of an international network is called as ______

A)

Global address

B)

IP address

C)

Network address

D)

Physical address

Correct Answer : Option (A) : Global address

Explanation : Global address is a network address that is unique internationally and is used as a common address by all the users of the network. It is used to create a virtual circuit identifier.

7 .

Steps required in setup process are ___________

A)

Setup request and acknowledgement

B)

Setup and termination steps

C)

Setup request and setup response

D)

Setup request and setup termination

Correct Answer : Option (A) : Setup request and acknowledgement

Explanation : Setup request (sent by a source) and acknowledgement (sent by the destination) are the steps in the setup process. Both the ends’ switches make table entries during the setup process.

8 .

Delay of the resource allocated during setup phase during data transfer is ________

A)

constant

B)

same for each packet

C)

different for each packet

D)

increases for each packet

Correct Answer : Option (B) : same for each packet

Explanation : If a resource is allocated during setup phase, delay is same for each packet as there is only one-time delay during the setup phase and no delay during the data transfer phase.

9 .

In data transfer phase, how many columns does the table contain?

A)

2

B)

3

C)

4

D)

5

Correct Answer : Option (C) : 4

Explanation : The switch maintains a table for each Virtual Circuit Network. In the data transfer phase, it maintains 2 columns each for incoming data and outgoing data. The columns are in the following order: Source port, Source VCI, Destination port, Destination VCI.

10 .

Frame Relay is cheaper than other _____

A)

LANs

B)

MANs

C)

WANs

D)

Multipoint Networks

Correct Answer : Option (C) : WANs

Explanation : Frame relay is a standardized wide area network technology and is popularly used because it is cheaper than leased line WANs. It is also very simple to configure user equipment in a Frame Relay network.