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.

Reviewing TCP

As you learned in Chapter 3, “TCP/IP,” TCP creates a ...

Get Cisco Networking Essentials now with the O’Reilly learning platform.

O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.