Data Link Layer Computer Networks Questions and Answers

1.

Automatic repeat request error management mechanism is provided by

   A.) logical link control sublayer
   B.) media access control sublayer
   C.) network interface control sublayer
   D.) none of these

Answer: Option 'A'

​logical link control sublayer

2.

The data link layer takes the packets from _____ and encapsulates them into frames for transmission.

   A.) transport layer
   B.) application layer
   C.) network layer
   D.) physical layer

Answer: Option 'C'

​network layer

3.

Header of a frame generally contains

   A.) synchronization bytes
   B.) addresses
   C.) frame identifier
   D.) all of these

Answer: Option 'D'

all of these

4.

CRC stands for

   A.) cyclic repeat check
   B.) cyclic redundancy check
   C.) code redundancy check
   D.) code repeat check

Answer: Option 'B'

cyclic redundancy check

5.

Which one of the following is a data link protocol?

   A.) ethernet
   B.) point to point protocol
   C.) HDLC
   D.) All of these

Answer: Option 'D'

All of these

6.

When 2 or more bits in a data unit has been changed during the transmission, the error is called

   A.) random error
   B.) burst error
   C.) inverted error
   D.) none of these

Answer: Option 'B'

​burst error

7.

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

   A.) CSMA/CD
   B.) CSMA/CA
   C.) both (a) and (b)
   D.) None of these

Answer: Option 'C'

both (a) and (b)

8.

Which sublayer of the data link layer performs data link functions that depend upon the type of medium?

   A.) logical link control sublayer
   B.) media access control sublayer
   C.) network interface control sublayer
   D.) none of these

Answer: Option 'B'

media access control sublayer

9.

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

   A.) piggybacking
   B.) fletcher’s checksum
   C.) cyclic redundancy check
   D.) None of these

Answer: Option 'A'

piggybacking

10.

Which one of the following task is not done by data link layer?

   A.) framing
   B.) error control
   C.) flow control
   D.) channel coding

Answer: Option 'D'

channel coding


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