Lesson 4 - ICND1(1.3b) Use the TCP/IP model and their associated protocols to explain how data flows in a network

The TCP/IP model was brought to you by the folks at DARPA specifically for TCP/IP.  Other than that, it has exactly the same function as the OSI model.

You can see from this image borrowed from TCP/IP Guide (http://www.tcpipguide.com/free/t_TCPIPArchitectureandtheTCPIPModel-2.htm), that the TCP/IP Model maps directly to the OSI model.  More importantly, layers 1,2, 3, and 4  have the same function in both models, they are just named differently.  For a description of each layer, click the above link.

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At this point, you should be able to reproduce the above graphic from memory.  You should also be able to supply a short description for each layer.