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Which of the following controls will MOST effectively detect the presence of bursts of errors in
network transmissions?

Parity check

Echo check

Block sum check

Cyclic redundancy check

The cyclic redundancy check (CRC) can check for a block of transmitted datA. The workstations
generate the CRC and transmit it with the datA. The receiving workstation computes a CRC and
compares it to the transmitted CRC. if both of them are equal.then the block is assumed error free,
in this case (such as in parity error or echo check), multiple errors can be detected. In general,
CRC can detect all single-bit and bubble-bit errors. Parity check (known as vertical redundancy
check) also involves adding a bit (known as the parity bit) to each character during transmission.
In this case, where there is a presence of bursts of errors (i.e., impulsing noise during high
transmission rates), it has a reliability of approximately 50 percent. Inhigher transmission rates, this
limitation is significant. Echo checks detect line errors by retransmitting data to the sending device
for comparison with the original transmission.

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