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Computer Science · Oct / Nov 2021 · Paper 11 · Question 3

0478

As printed in the paper

The question as text

Five statements are given about the error-checking methods checksum, check digit and parity check.

Read automatically from the paper; the printed page above is exact.

Show the answer and mark scheme

  • 3(a)[5]

    One mark per each correct row.

    Statement

    Checksum

    Check

    Parity (✓)

    digit

    check (✓)

    (✓) uses an additional bit to create an

    odd or even number of 1s

    checks for errors on data entry

    compares two calculated values to
    see if an error has occurred

    will not detect transposition errors

    sends additional values when data is
    (✓) transmitted from one computer to

    another

  • 3(b)[1]

    ARQ
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