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One of the best break downs of the OSI model that I have seen today.

Die 8. Schicht -- OSI-Modell – Wikipedia

Comparison of TCP/IP Model and OSI Models, TCP/IP vs OSI

ISO Model and Protocols that go with them. More

IP-Networking: TCP/IP Architecture Model: 4-Layers vs. OSI 7 Layers

Understanding this model is essential for anyone who wants to be involved in the field of computer networking. If you have forgotten the OSI model or just want to get a crash course in it, this cheat sheet by Ccna-security.net should help

networking OSI TCP IP UDP ARP DNS 'concept maps' - Google 搜索