Transport Layer Concepts

Before moving to a more detailed discussion of TCP and UDP, it is worth pausing for a moment to focus on a few of the important concepts:

  • Connection-oriented and connectionless protocols

  • Ports and sockets

  • Multiplexing

These important concepts are essential to understanding the design of the Transport layer. You'll learn about these concepts in the following sections.

Connection-Oriented and Connectionless Protocols

To provide the appropriate level of quality assurance for any given situation, developers have come up with two alternative network protocol archetypes:

  • A connection-oriented protocol establishes and maintains a connection between communicating computers and monitors the state of that connection over the course ...

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