The Concept of Layers (OCR GCSE Computer Science)

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Robert Hampton

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The Concept of Layers

  • Networks rely on many complex parts all working together at the same time, from different types of network, the different operating models, the internet, wired and wireless to encryption, addressing and protocols
  • Managing the complexity of networks is helped with the use of layers

What is a layer?

  • A layer is a sub part of a more complex task
  • Dividing network tasks into layers reduces the complexity and makes each layer more manageable
  • An example of layers can be seen in the TCP/IP protocol which uses a 4-layer model known as a 'stack'

tcp-ip-stack-computer-science-revision-notes

Exam Tip

In the exam you are required to understand the concept of layers but you are not expected to remember the names of the layers!

What are the advantages of layers?

  • Layers are self-contained which makes managing, repairing and upgrading easier as each layer can be worked on independent of other layers
  • Layers allow for focus on specific parts of a protocol without affecting other layers
  • Promotes data exchange (interoperability) between hardware and software

Worked example

TCP/IP is a set of protocols based on layers.

  1. With regards to network protocols, define what is meant by a ‘layer’ [1]
  2. Describe one advantage of using layers to construct network protocols [2]

Answers

  • Breaking up a complex task into more manageable sub tasks

  • Self-contained
  • …it allows different developers to concentrate on one aspect of the network 
  • A layer can be taken out and edited without affecting other layers…
  • …it promotes interoperability between vendors and systems

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Robert Hampton

Author: Robert Hampton

Rob has over 16 years' experience teaching Computer Science and ICT at KS3 & GCSE levels. Rob has demonstrated strong leadership as Head of Department since 2012 and previously supported teacher development as a Specialist Leader of Education, empowering departments to excel in Computer Science. Beyond his tech expertise, Robert embraces the virtual world as an avid gamer, conquering digital battlefields when he's not coding.