CENG210 Comm-Net-Fund_4

The error control service adopted by the data link layer enables it to

• detect error

• correct error

• both of them

The data link layer service that enables a network device to send data through different network topologies is

• framing

• physical addressing

• access control

• flow control

In a scenario of sending data from a source to a destination, the ................. addresses change over links, however, the .................... addresses remain constant from end to end.

• physical, logical

• logical, physical

• both of them

• none of them

The receiver can follow the .................................. technique where it can detect errors and request the sender to resend received messages with errors.

• forward error correction

• correction by retransmission

• coding

• redundancy

In block coding, the number of ........................... is greater than the number of ...................................

• codewords, datawords

• datawords, codewords

• both of them

In case that the minimum hamming distance equals 2, the receiver can detect up to 2 errors.

• True

• False

The minimum hamming distance of the coding scheme shown in the table is

• 1

• 2

• 3

• none of them

The minimum hamming distance in parity check code is

• 1

• 2

• 3

• none of them

The figure shows the encode and decoder for the ........................................ coding scheme.

• block

• convolution

• cyclic redundancy check

• checksum