Computer Science for IGCSE & O level - Data Transmission (Section 4 - No. 28)
Which error detection method involves adding all the 1s in the payload and storing it as a value in the trailer?
Parity checks.
Checksums.
Cyclic redundancy checks (CRCs).
Echo checks.
解释
Checksums involve calculating a sum of the data, which is used for error detection.