The Transport Layer
The Transport layer combines features of the OSI Transport and Session layers with a dash of Application layer just for flavor. While the TCP/IP model is certainly involved with the assembly and disassembly of data, it also defines other functions, such as connection-oriented and connectionless communication.
Connection-oriented vs. Connectionless Communication
Some protocols, like the popular Post Office Protocol (POP) used for sending e-mail messages, require that the e-mail client and server verify that they have a good connection before a message is sent (Figure 1.14). This makes sense because you don’t want your e-mail message to be a corrupted mess when it arrives.
FIGURE 1.14 Connection between e-mail client ...
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