Chapter 8

Which of the following are error detection methods?

• Simple Parity check

• Two-dimensional Parity check

• CRC

• Checksum

Which error detection method consists of just one redundant bit per data unit?

• Simple Parity Check

• Two-Dimensional Parity Check

• CRC

• Checksum

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

• double-bit

• burst

• single-bit

• none of above

In modulo-2 arithmetic, we use the _______ operation for both addition and subtraction

• XOR

• OR

• AND

• XAND

CRC detection method is based on _______ operation.

• addition

• multiplication

• binary division

• subtraction

The Hamming Distance between equals codewords is _______.

• 0

• 1

• 2

• 3

In _______ error correction, the receiver corrects errors without requesting retransmission.

• forward

• backward

• onward

• reverse

At the CRC checker, _______ means that the data unit is damaged.

• a string of Os

• a string of alternating 1s and 2s

• a string of 1s

• a non-zero remainder

_______ is an error detection checking technique that appends a sequence of redundant bits derived from binary division to the data unit.

• Checksum

• Hamming Code

• CRC

• Parity Check

The checksum bits for 555 and 666 hexadecimal data is _______.

• AAA

• BBB

• 111

• FFF