An odd parity byte check is used to check for errors in data that is transmitted from a computer to a printer. Three bytes of data need to be transmitted. Give the correct parity bit that would be added to each byte of data for an odd parity byte check.

parity bit	byte of data
Table answer byte1_parity bit	0101110
Table answer byte2_parity bit	1110111
Table answer byte3_parity bit	1000100

4(b)(i)Error Detection CorrectionMedium2 marks

There is an error in the data after transmission. This error is not detected by the parity byte check. Explain why the error may not be detected by a parity byte check.

Answer

0 words

4(b)(ii)Error Detection CorrectionEasy2 marks

Give two other error detection methods that could be used.

Two answers required.

4(c)(i)Encryption CiphersEasy1 mark

The data that is transmitted is encrypted. Give one method of encryption that could be used.

4(c)(ii)Encryption CiphersMedium1 mark

State what is meant by an encryption key.

4(c)(iii)Encryption CiphersEasy1 mark

State the name given to the encrypted data.