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In this chapter, we look at the individual layers of the OSI Reference Model. Each layer in the OSI model has certain characteristics that define it, and also various protocols normally associated with it. I'll describe how each layer functions in the OSI layer stack, outline the specific types of activities for which each is normally responsible, and provide some examples of the technologies and protocols that reside at each layer. Understanding the nuances of each layer will help you understand all the technologies that use them.

Keep in mind, however, that the descriptions in this section are generic. To ...

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