Each layer of the OSI model and TCP/IP explained.

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My name is Dan and I am a college computer instructor specializing in teaching Cisco Networking Academy courses on the CCNA, CyberOps Associate, DevNet Associate, and CCNA Security. I have a lot of fun teaching tons of other computer topics as well from, Linux to HTML5 game programming. Check out my channel and all of my computer topics, playlists, and don't forget to Subscribe, its free!