|  |  | Summary
In this chapter, you learned about the functions of the transport layer and the different processes that occur as data packets travel through this layer. More specifically, you learned that:

- The transport layer regulates information flow to ensure end-to-end connectivity between host applications reliably and accurately

- The TCP/IP protocol of Layer 4 (transport layer) has two protocols: TCP and UDP

- TCP and UDP use port (or socket) numbers to keep track of different conversations that cross the network at the same time, to pass information to the upper layers

- The three-way handshake sequence synchronizes a logical connection between the endpoints of a network

Now that you have completed this chapter, you should have a firm understanding of how the transport layer provides transport services from the host to the destination, often referred to as end-to-end services. In the next chapter, you will examine what happens to data packets as they travel through the session layer or Layer 5 of the OSI Model.