Which of the following controls will MOST effectively detect the presence of bursts of errors in network transmissions?
A.
Parity check
B.
Echo check
C.
Block sum check
D.
Cyclic redundancy check
Explanation:
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.