Computer Science · May / June 2024 · Paper 12 · Question 6
0478
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The table contains statements about error detection methods. Complete the table by giving the correct error detection method for each statement. error detection method statement …………………………………………… An odd or even process can be used. …………………………………………… A value is calculated from the data, using an algorithm. This happens before and after the data is transmitted. …………………………………………… A copy of the data is sent back to the sender by the receiver. …………………………………………… Acknowledgement and timeout are used. …………………………………………… A value is appended to data that has been calculated using the data. This value is checked on data entry. [5]
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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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