By convention, servers on TCP/IP networks monitor (and are expected to be found at) certain access points called ports Ports are logical, not physical, addresses within a domain When defaults are used, port numbers don't need to be specified But if a particular type of server isn't using the conventional port number (such as 80 for an unsecure web server), then the port number has to be specified with the server (for example, http: //www ourserver com: 8080)
Terminations in equipment systems at which various types of communication devices, switching equipment, and other devices are connected to the transmission network
An address to which messages can be sent and that has a queue holding the messages received by the port but not yet consumed by the threads Ports are attached to actors Ports can be assembled into groups adding a multicast facility See also message handlers
A computer on the internet using TCP/IP protocols uses various numbered "virtual" ports to differentiate between the various servers the computer may be running In a standard setup the telnet server is assigned port 23, gopher is assigned port 70, and so on (Note: These are not to be confused with the hardware ports in the back of your machine, where printers and other peripherals are attached )
A generic name for the various sockets (and their associated electronics), usually at the back of the computer, to which external devices are connected Used in relation to the Ethernet to indicate network connections
A pathway into and out of a computer or network device such as a router Major classes of applications have unique port numbers associated with them For example, HTTP servers usually listen on port 80
There are many kinds of ports most commonly found in modern PCs most are used internally and no external connections are visible Others terminate as plug outlets for external components to plug into These include