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IP Routing Fundamentals by Mark A. Sportack

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Logical Adjacency

The identification and stratification of the sequence of events that support a networked communications session is a tremendously powerful concept. One of the key benefits of this approach is that it enables a concept known as logical adjacency, which refers to the apparent capability of peer-layer protocols on source and destination machines to communicate directly with each other. The IP protocols on a source machine are logically adjacent to the IP protocols on the destination machine that they are communicating with, for example.

This isn't, of course, how communication actually occurs. In reality, the vertical orientation of a protocol stack is an acknowledgment of the functional flow of processes and data within each ...

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