2. The OSI 7 Layers Model
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The OSI is a model defined by ISO, which splits the network to 7 layers.
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Each of the layers should need to communicate only with
the layer above it and the layer below it, through well defined
interfaces
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That way it should be possible to replace each layer
implementation with a different implementation, with no need to
modify any additional network component
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The OSI model defines only
the role each layer should perform in the network.
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Here is a diagram of the OSI model:
Written by Shlomi Fish