So if we look at the OSI model compared with the TCP model, they don't quite line up but they are more or less the same concepts. So this diagram shows the two side by side and so you can see that the for example in TCP/IP, the application is responsible for the application and presentation and the session functions. The transport in TCP transport protocol does the transport and possibly a bit of the session layer functionality as well but the two do line up more or less side by side.
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