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Cambridge IGCSE Computer Science practice

Paper 1 structured question: Methods of error detection

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Attempt questionMethods of error detection revisionRevise the key idea

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Methods of error detection

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Paper 1Computer Systems2 marks

Understanding ARQ systems in data communication.

Description

Timeouts in ARQ Systems

Timeouts are used in ARQ systems to manage the waiting period for acknowledgments. If an acknowledgment is not received within a specified time, the sender assumes the packet was lost and retransmits it.

  1. a

    Describe the function of timeouts in an ARQ system.

    Aim for approximately 2 distinct marking points.

    [2]

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Paper 1 structured question: Methods of error detection

Paper 1Computer Systems3 marks

Description

Automatic Repeat Request (ARQ) System

An ARQ system uses positive and negative acknowledgments to ensure data integrity during transmission. If a packet is received correctly, a positive acknowledgment (ACK) is sent. If there is an error, a negative acknowledgment (NACK) is sent, prompting retransmission. Timeouts are also implemented to manage the waiting period for acknowledgments.

  1. a

    Explain the role of positive and negative acknowledgments in an ARQ system.

    Aim for approximately 3 distinct marking points.

    [3]