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'
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
Exam Tip
In the exam you are required to understand the concept of layers AND describe the main function of TCP/IP layers
