Error Detection and Correction Questions

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1.

Which error detection method uses one's complement arithmetic?

A

Simple parity check

B

Two-dimensional parity check

C

CRC

D

Checksum

Correct Answer: D

None.

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2.

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

A

Simple parity check

B

Two-dimensional parity check

C

CRC

D

Checksum

Correct Answer: A

None.

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3.

In cyclic redundancy checking, what is the CRC?

A

The divisor

B

The quotient

C

The dividend

D

The remainder

Correct Answer: D

None.

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4.

In cyclic redundancy checking, the divisor is _______ the CRC

A

The same size as

B

one bit less than

C

one bit more than

D

none of the above

Correct Answer: C

None.

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5.

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

A

double-bit

B

burst

C

single-bit

D

none of the above

Correct Answer: B

None.

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6.

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

A

backward

B

onward

C

forward

D

none of the above

Correct Answer: C

None.

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7.

In ________ error correction, the receiver asks the sender to send the data again.

A

backward

B

retransmission

C

forward

D

none of the above

Correct Answer: B

None.

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8.

In modulo-2 arithmetic, __________ give the same results.

A

addition and multiplication

B

addition and division

C

addition and subtraction

D

none of the above

Correct Answer: C

None.

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9.

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

A

XOR

B

OR

C

AND

D

none of the above

Correct Answer: A

None.

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10.

We add r redundant bits to each block to make the length n = k + r. The resulting n-bit blocks are called _________

A

datawords

B

blockwords

C

codewords

D

none of the above

Correct Answer: C

None.

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