The Concept of Layers (OCR GCSE Computer Science)
Revision Note
Written by: Robert Hampton
Reviewed by: James Woodhouse
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'
Examiner Tips and Tricks
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.
With regards to network protocols, define what is meant by a ‘layer’ [1]
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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