DCN Quiz-2

In cyclic redundancy check, the CRC is  ------------------ than the divisor.

• Same size as

• one bit more than

• one bit less than

• Two bits more than

Compare the codeword and dataword given and write the type of the error

dataword :10001101

codeword :11001001

• a) Single bit error

• b) 2-bit error

• c) burst error

• d) both b and c

The 4B/5B block coding , k = 4(dataword length) and n = 5(codeword legth). How many valid code words possible.

• 32

• 16

• 20

• 9

In cyclic redundancy check the remainder at the sender

• Is considered as CRC at receiver

• Is discarded

• Becomes the dividend at the receiver

• Becomes the divisor at the receiver

Which of the following is not a phase of a circuit-switched network

• Connection setup

• Data transfer

• Waiting for an acknowledgement

• Connection teardown.

A digital signal has nine levels. How many bits are needed per level?

• 3

• 4

• 2

• 1

Distortion refers to

• Signal losses some  of its energy

• Signal changes its shape

• Signal is corrupted

• None of the above

Maximum bit rate of a noiseless 3-KHz channel with two signal levels is

• 3000bps

• 1500bps

• 8000bps

• 6000bps

The bandwidth-delay product defines the number of bits that can fill the link.

• True

• False

How  can  we  represent  the  number  21  in  one’s  complement  arithmetic using only four bits?

• 0110

• 1001

• 0101

• 1010