XNS ( Xerox Network Systems) Clearinghouse XNS ( Xerox Network Systems) Time Protocol Resource Location Protocol (RLP)-used for determining the location of higher level services from hosts on a network Simple Mail Transfer Protocol (SMTP)-used for e-mail routing between mail servers Telnet protocol-unencrypted text communications Secure Shell (SSH)-used for secure logins, file transfers ( scp, sftp) and port forwarding
Programming technique for specifying system-allocated (dynamic) ports
On Unix-like operating systems, a process must execute with superuser privileges to be able to bind a network socket to an IP address using one of the well-known ports. They are used by system processes that provide widely used types of network services. The port numbers in the range from 0 to 1023 are the well-known ports or system ports. Multiple applications are known to use this port. Port is not registered with IANA for the application Port is registered with IANA for the application SOURCE Wikipedia Dec 2014 Table legend Use
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