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A diagram of the OSI model is shown below (note that this is
not a complete listing of the protocols contained within each
layer of the model):
Figure 2-8. OSI Seven Layer Network Model
Each layer is a distinct set of programs executing a distinct
set of protocols designed to accomplish some necessary
tasks. They are separated from the other layers within the
same system or network, but must communicate and
interoperate. This requires very well-defined and well-known
methods for transferring messages and data. This is
accomplished through the protocol stack.
Protocol layering as simply a tool for visualizing the
organization of the necessary software and hardware in a
network. In this view, Layer 2 represents switching and
Layer 3 represents routing. Protocol layering is actually a
set of guidelines used in writing programs and designing
hardware that delegate network functions and allow the
layers to communicate. How these layers communicate
within a stack (for example, within a given computer) is left to
the operating system programmers.
146 VH-2402-L3 Management Guide
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