Data is transmitted between a computer and a printer using a wired connection. The computer transmits the data to the printer. The printer transmits data and interrupts to the computer.

7(a)Data Transmission MethodsMedium2 marks

State whether the method of transmission should be serial or parallel. Justify your choice.

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7(b)Data Transmission MethodsMedium2 marks

State whether the method of transmission should be simplex, half‑duplex or full‑duplex. Justify your answer.

Answer

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Context for 7(c)

The transmitted data may contain an error.

7(c)(i)Error Detection CorrectionEasy1 mark

Give one way in which an error can occur during data transmission.

7(c)(ii)Error Detection CorrectionMedium3 marks

The computer and printer agree to use automatic repeat query (ARQ). Explain how ARQ using negative acknowledgement is used to establish that data is received without error.

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