Layers in Computer Networks

Posted by : Saumyaraj Monday 19 August 2013

Why we need layers in computer networks???

I always wondered,why we need layers in computer networks???
We have heard about the layers like Link layer,Network layer,Transport layer,Application layer but why???

The answer is because it simplifies our tasks. Let us see how.

Application layer - User Interface in networking will be taken care by it
Transport layer - Takes Responsibility of communicating to a specific process in a computer connected in the Network
Network layer - Takes Responsibility of Routing
Link Layer - Takes Responsibility of delivering message to specific computer in a Network
Physical layer - Takes Responsibility of converting data into bits and sending them through a wire.

Saw?? How our life is easy?? We divided Tasks and each layer is responsible for its task.