As in the last two chapters, this chapter starts with a general discussion of the functions of an OSI layer—in this case, Layer 4, the transport layer. Two specific transport layer protocols—the Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP) are covered later in the chapter. This chapter covers OSI Layer 4 concepts, but mostly through an examination of the TCP and UDP protocols. So, this chapter briefly introduces OSI transport layer details and then dives right into how TCP works.
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