8TRANSPORT LAYER PROTOCOLS

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In this chapter, we’ll continue to examine individual protocols and how they appear at the packet level. Moving up the OSI model, we’ll look at the transport layer and the two most common transport protocols, TCP and UDP.

Transmission Control Protocol (TCP)

The ultimate goal of the Transmission Control Protocol (TCP) is to provide endto-end reliability for the delivery of data. TCP, which is defined in RFC 793, handles data sequencing and error recovery, and ultimately ensures that data gets where it’s supposed to go. TCP is considered a connection-oriented protocol because it establishes a formal connection before transmitting ...

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