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OSI Reference Model Layers
Finally, after much ado—hopefully
not too much!—it is time to take a look at the actual
individual layers of the OSI Reference Model. As discussed in the
section on OSI model concepts, each layer
has certain characteristics that define it, and also various protocols
normally associated with it. Understanding the nuances of each layer
will help you understand all the technologies that use them.
In this section, I describe each
of the OSI Reference Model layers individually. For each one I provide
its name and layer number, describe its general function in the OSI
layer stack, and outline the specific types of activities for which
each is normally responsible. I also provide some examples of the technologies
and protocols that reside at each layer. Keep in mind, however, that
the descriptions in this section are generic. To really comprehend
the various layers and how they are uses, there is no substitute for
reading the details of the individual protocols that function at each
layer, covered elsewhere in this Guide.
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Quick navigation to subsections and regular topics in this section
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Version 3.0 - Version Date: September 20, 2005
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Related Information: For assistance in remembering the correct order of the layers, see