Note AcademyNote Academy
Start

Computer Science · Oct / Nov 2020 · Paper 12 · Question 2

0478

As printed in the paper

The question as text

Four 7-bit binary values are transmitted from one computer to another. A parity bit was added to each binary value creating 8-bit binary values. All the binary values have been transmitted correctly.

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

Show the answer and mark scheme

  • 2(a)[4]

    One mark for each correct row:

    Even

    Odd

    8-bit binary value

    (✓)

    (✓)

    11111111

    01100110
    01111011
    10000000

  • 2(b)[5]

    Any five from:

    A value is calculated from the data
    The value is calculated using an algorithm // by example
    The value is appended to the data to be transmitted
    Value is recalculated after transmission
    Values are compared
    If the values match the data is correct // if the values do not match the data is incorrect
Practise this paper →

Make a free account to save your answers and see your weak topics and ask the AI why a wrong answer is wrong.