TCP ports

TCP ports
   In a TCP/IP network when a computer connects with another computer to access a specific service, and end-to-end connection is established and a socket is set up at each end of the connection. This socket is created at a particular port number, dependingontheapplicationinuse.TableT.1 lists the port numbers used for some of the common protocols.
   TABLE T.1 PORT NUMBERS FOR COMMON PROTOCOLS
   Port Number / Protocol
   21 / File Transfer Protocol
   23 / Telnet
   25 / Simple Mail Transfer Protocol
   70 / Gopher
   79 / Finger
   80 / Hypertext Transfer Protocol
   119 / Network News Transfer Protocol

Dictionary of networking . 2014.

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