====== Telnet ======

An [[application protocol]] that was originally designed to allow a user to log-in to a remote host over a network. The word is a a contraction of **Tel**ecommunication-**Net**work. //Telnet// is normally used to provide a [[cli|command-line interface]] to a remote [[host]] and is a very simple protocol. Characters are sent from the user's keyboard to the remote server and echoed back in a console window for display in the client's [[user agent]] (usually a [[terminal emulator]]). //Telnet// uses [[port_number|port]] 23 to communicate with the server [[daemon]] process [[telnetd]]. Because //telnet// exchanges its messages in plain-text (including logins and passwords), Many ISPs prohibit the use of //telnet// on the grounds of security. They require instead the use of the secure shell protocol (user agent [[ssh]] and server [[sshd]]) which encrypts all data sent to and received from the server. //Telnet// was developed in 1969 beginning with [[http://tools.ietf.org/html/rfc15|RFC 15]] and standardized as [[http://en.wikipedia.org/wiki/STD_8|IETF STD 8]] and is therefore one of the first [[Internet]] standards. You can read more about //telnet// on [[wp>Telnet|Wikipedia]]. 
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