TCP/IP is the most widely used networking protocol and is often compared to the industry-defined OSI model.
Figure 2-2 displays the TCP/IP model in relation to the OSI model and where the protocol suite of TCP/IP lines up with the ISO standard. This comparison is provided to demonstrate that TCP/IP does not exactly conform to the OSI model. For example, the TCP/IP model has no Layer 5 or 6.
Figure 2-2 OSI and TCP/IP Models
OSI Model TCP/IP Model
Applications such as Telnet, FTP. and ping
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