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Learning objective

Recognize that data is divided into packets for transmission, describe the components of a packet, and explain the packet switching process. A packet consists of a header, payload, and trailer. The header contains the destination address, packet number, and originator's address. Data is segmented into packets that may take different routes, managed by routers. Packets can arrive in a different order, and they are reordered once all packets have been received.

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Exam focus

  • Read the explanation.
  • Check key terms.
  • Practise with linked questions.
Cambridge IGCSE Computer ScienceData transmission

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Quick explanation

Recognize that data is divided into packets for transmission, describe the components of a packet, and explain the packet switching process. A packet consists of a header, payload, and trailer. The header contains the destination address, packet number, and originator's address. Data is segmented into packets that may take different routes, managed by routers. Packets can arrive in a different order, and they are reordered once all packets have been received

  • This point belongs to Types and methods of data transmission, especially Types and methods of data transmission outcomes.
  • You need to be able to recognize that data is divided into packets for transmission, describe the components of a packet, and explain the packet switching process. A packet consists of a header, payload, and trailer. The header contains the destination address, packet number, and originator's address. Data is segmented into packets that may take different routes, managed by routers. Packets can arrive in a different order, and they are reordered once all packets have been received.
  • The key ideas to know are Understand, Describe, and Explain.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

UnderstandDescribeExplain

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Paper 1Computer Systems1 marks

Description

Components of a Data Packet

A data packet consists of a header, payload, and trailer. The header includes the destination address, packet number, and originator's address. The payload contains the actual data being transmitted, and the trailer may include error-checking information.

  1. a

    State the three main components of a data packet.

    Aim for approximately 1 distinct marking point.

    [1]
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