O-LevelComputer ScienceData Transmission2210/12 · May/June 2024 · Q65 Marks

The table contains statements about error detection methods. Complete the table by giving the correct error detection method for each statement.

table part 1Statement: An odd or even process can be used.
table part 2Statement: A value is calculated from the data, using an algorithm. This happens before and after the data is transmitted.
table part 3Statement: A copy of the data is sent back to the sender by the receiver.
table part 4Statement: Acknowledgement and timeout are used.
table part 5Statement: A value is appended to data that has been calculated using the data. This value is checked on data entry.

Mark scheme

Marking points from the official mark scheme (May/June 2024). The mark or mark type is shown in brackets.

[5] One mark for each correct method. error detection method statement parity (check/bit/byte/block) An odd or even process can be used. checksum A value is calculated from the data using an algorithm. This happens before and after the data is transmitted. echo check A copy of the data is sent back to the sender by the receiver. automatic repeat query/request // ARQ Acknowledgement and timeout are used. check digit A value is appended to data that has been calculated using the data. This value is checked on data entry.

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