CCNA Discovery 2, Chapter 7
7.2.1: Internet service providers (ISP) support many services and applications. These applications use UDP and/or TCP at the transport layer and IP at the network layer. ISP support personnel must be familiar with the TCP/IP protocols to best maintain reliable communication for users. Table 29-3 provides examples and functions of protocols used in the four layers of the TCP/IP model.
Table 29-3. TCP/IP Protocols
Note that the application, presentation, and session layers of the OSI model define functions in the application layer of the TCP/IP model. In addition, the data link and physical layers of the OSI model are ...
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