Published at LXer:

Continuing our journey, it's time to take a trip up the OSI Reference Model, and learn what this mysterious thing is all about. The network stack is of great significance, but not so much that it's the first thing you should learn. We've waited to start the "layers" discussion for good reason: Many so-called networking classes will start by teaching you to memorize the name of every layer and every protocol contained within this model. Don't do that. Do realize that layers 5 and 6 can be completely ignored, though.

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