TELNET

WHAT IS TELNET???

Telnet (Telecommunication network) is a network protocol used on the Internet or local area network (LAN) connections. It was developed in 1969 beginning with RFC 15 and standardized as IETF STD 8, one of the first Internet standards. Typically, Telnet provides access to a command-line interface on a remote machine.
The term telnet also refers to software which implements the client part of the protocol. Telnet clients are available for virtually all computer platforms. Most network equipment and OSes with a TCP/IP stack support some kind of Telnet service server for their remote configuration (including ones based on Windows NT). Because of security issues with Telnet, its use has waned in favor of SSH for remote access.
"To telnet" is also used as a verb, meaning to establish an interactive connection with the Telnet protocol. For example, a common directive might be: "To change your password, telnet to the server, login and run the password command." Most often, a user will be telnetting to a Unix- like server system or a network device such as a router and obtain a login prompt to a command line text interface or a character-based full-screen manager.
On many systems, a Telnet client application may also be used to make interactive raw-TCP sessions. It is commonly believed that a Telnet session which does not use the IAC (character 255) is functionally identical. This is not the case however due to special NVT (Network Virtual Terminal) rules such as the requirement for a bare CR (ASCII 13) to be followed by a NULL (ASCII 0).