The OSI Model

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The OSI Model

The OSI model takes networking tasks and divides them into seven fundamentally different layers to make it easier for the industry to move forward and evolve. With the tasks segregated into functional units, a person writing the code for a network card doesn’t have to worry about what applications are going to be run over it; conversely, a programmer writing an application doesn’t have to worry about who manufactured the network card. How-ever, to make this work, everything must be written to comply with the boundary specifications between each of the seven layers of the model. Although the TCP/IP protocol suite only maps to a four-layer model, these four layers provide the same functionality as each of the seven layers of the OSI model.

This chapter examines the functionality of each of the seven layers first and then describes the function of the boundary layers between them. A good understanding of these layers will provide the proper background for looking at the four layers of the TCP/IP protocol suite.

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