A-LevelComputer ScienceCommunication and internet technologies9618/12 · Oct/Nov 2025 · Q12 Marks
Draw one line from each verification method to indicate whether it is used during data transfer or data entry. Verification Method Parity byte check Checksum Visual check Parity block check Use Data transfer Data entry
- Draw one line from each verification method to indicate whether it is used during data transfer or data entry. Verification Method Parity byte check Checksum Visual check Parity block check Use Data transfer Data entry[2]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2025). The mark or mark type is shown in brackets.
- 1 mark for 2 or 3 correctly connected verification method boxes, 2 marks for all 4 correct
- Verification Method: Parity byte check -> Use: Data transfer
- Verification Method: Checksum -> Use: Data transfer
- Verification Method: Visual check -> Use: Data entry
- Verification Method: Parity block check -> Use: Data transfer
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