Sometimes the simplest elements of modern networking are the easiest to forget, whether you're talking about calculating a subnet or understanding performance bottlenecks at the protocol level.
This guide is written with two audiences in mind: Network technicians who could use a refresher course on concepts they haven't needed since they crammed for their first certification, and IT managers with a background in disciplines outside networking who could use a cheat-sheet when they're dealing with this involved and complex field.
Whether we're covering new ground or introducing new concepts, we hope you find helpful this look at the foundation of networking.
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