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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.
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Ernie Beek
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Simply put:

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
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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ChiefIT
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