logo

Cambridge IGCSE Computer Science practice

Paper 1 structured question: Methods of error detection

Try the question first, then check the answer and practise the same topic again.

Attempt questionMethods of error detection revisionRevise the key idea

At a glance

1

Paper

3

Marks

Topic

Methods of error detection

Exam-style question

Try this first

Paper 1Computer Systems3 marks

Understanding ARQ systems in data communication.

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]

0 of 1 part answered

Answer every part before opening the mark scheme.

Common mistake

No common mistake is linked to this question yet.

Related flashcards

Flashcard 1 of 6

Press Space to flip, arrows to move

Related practice questions

Question 1 of 5

Choose an answer, get feedback, then move sideways through the set.

0 of 4 attempted

Paper 1 structured question: Methods of error detection

Paper 1Computer Systems2 marks

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]