Unit II Computer Networks Quiz

Which of the following is necessary for multiplexing?

• modems

• high capacity data links

• QAM

• Parallel Transmissions

Three main functions of the data link layer:

• line control

• error control

• flow control

• all the above

A _______ error means that two or more bits in the data unit have changed.

• single bit error

• burst error

• transmission error

• data error

Guard bands increase the bandwidth for ______

• FDM

• TDM

• Asynchronous TDM

• Synchronous TDM

In _________ method, the sender can transmit several frames.

• Sliding window

• ENQ/ARQ

• stop and wait

• all the above

Regulation of rate of transmission of data frames is called _______.

• flow control

• error control

• line discipline

• error detection

Which error detection method uses parity bits?

• VRC

• ENQ

• Checksum

• CRC

In CRC method, what is CRC?

• divisor

• dividend

• quotient

• remainder

In ___________ ARQ, only the unacknowledged frame is retransmitted.

• selective-reject

• ENQ/ACQ

• stop and wait

• All the above

If there is change is single bit it is called _______ error.

• single bit

• burst

• none

• all the above