Exploring Transport Layer Protocols
The Transport layer is responsible for identifying the Application layer protocol to the destination computer. It does this by using what are called port numbers. You also learned that there are two transport protocols: UDP and TCP. UDP is used for broadcast and multicast transmissions, and TCP is used for unicast transmissions. TCP and UDP use these port numbers to identify services, protocols and applications that operate on the Application layer.
In this section, you'll look at more details of UDP and TCP, paying particular attention to the additional features of TCP that allow it to add reliability and help maximize network performance.
As you learned in Chapter 3, “TCP/IP,” TCP creates a ...