Express Learning: Data Communications and Computer Networks

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Reference Models and Network Devices

1. What is meant by a reference model? Why do we need it?

Ans: A reference model is a conceptual layout that describes how communication between devices should occur. For efficient communication, the reference model identifies the tasks involved in inter-computer communication and divides them in logical groups called layers, with each layer performing a specific function. A communication system designed in such a manner is referred to as layered architecture. We need a reference model, as it provides various advantages, some of which are as follows:

It permits different types of network software and ...