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You are here: Home / CompTIA / Network+ / Section I: Networking Concepts / Chapter 5: Common Network Protocols / Port Numbers

Port Numbers

Port numbers are assigned to different protocols and services so that a user will know how and what to access at the other end and to identify specific applications. They are also used to track the session associated with that protocol. As explained in Chapter 1, the TCP and UDP headers include a 16-bit source and destination port, so port numbers can be represented in the range of 0 to 65535 (the maximum decimal number that can be represented on 16 bits).

Port numbers fall into two categories:

  • Well-known port numbers
  • Temporary port numbers . . .

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