OSI Model v.s. TCP/IP Model v.s. Cisco 3 Layer Model

A computer communication protocal is a set of rules that govern the exchange of information whin a network. Communication protocols define the manner in which peer processes communicate among various computer hardware devices.

You can organize the modules of protocal software on each machine into "layers". Each layer will handle a specific communication sub-problem. There are many specific advantages of layering such as data hiding and encapsulation, reduced complexity, increased evolution, easy extension and multi vendor integration.

OSI model vs TCP/IP model

The most mommon layered Models are
a. ISO's OSI Layered Model
b. TCP/IP Layered Model
c. Cisco's 3 Layered Model
d. IBM's SNA Model (don't discuss it here)

This tutorial series will explain and compare these models.

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