Recall that there are two popular network models in use: the OSI Reference Model and the TCP/IP Reference Model. In this chapter you’ll learn about the top three layers of the OSI model. Those three OSI layers correspond to the Application Layer (top layer) in the TCP/IP model. FIGURE 6-1 shows how the layers in each model (OSI and TCP/IP) relate to one another.
FIGURE 6-1 OSI model compared to the TCP/IP model.
The fact that the TCP/IP model groups these layers together should tell you something. Although each layer has its own responsibilities, they are closely related. The functions you’ll ...
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