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OSI and TCP
Could anyone give me an in depth explanation of the differences between the OSI model and the TCP-IP system, I understand that the OSI model has 2 extra layers but is only theoretical.
And the "Network Access" layer in the TCP model is represented by the "Physical" and "Data Link" layer in the OSI model.
Ooops, forgot that one :-~
That link is pretty much a decent web overview. Both the OSI and the TCP/IP models have entire books dedicated to them so to get a full in depth review here from someone is a big ask. If you want to look in to it in greatest detail, then purchasing a book on a networking overview would be a better idea. This was a pretty good overview title http://www.amazon.co.uk/Computer-Networking-First-step-Your-World/dp/1587201011/ref=sr_1_4?s=books&ie=UTF8&qid=1345818885&sr=1-4 and this gives more focus on TCP/IP http://www.amazon.co.uk/TCP-IP-First-Step-Mark-Sportack/dp/1587201089/ref=sr_1_1?s=books&ie=UTF8&qid=1345818924&sr=1-1
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The three top layers in the OSI model—the application layer, the presentation layer and the session layer—are not distinguished separately in the TCP/IP model where it is just the application layer
Have a look at:
http://en.wikipedia.org/wiki/TCP/IP#OSI_and_TCP.2FIP_layering_differences