Telnet

Network protocol for bidirectional communication using a virtual terminal connection / From Wikipedia, the free encyclopedia

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Telnet (short for "teletype network")[1][2] is a client/server application protocol that provides access to virtual terminals of remote systems on local area networks or the Internet.[3] It is a protocol for bidirectional 8-bit communications. Its main goal was to connect terminal devices and terminal-oriented processes.[4]

Telnet consists of two components: (1) the protocol itself which specifies how two parties are to communicate and (2) the software application that provides the service. User data is interspersed in-band with Telnet control information in an 8-bit byte oriented data connection over the Transmission Control Protocol (TCP). Telnet was developed in 1969 beginning with RFC 15, extended in RFC 855, and standardized as Internet Engineering Task Force (IETF) Internet Standard STD 8, one of the first Internet standards.[1][2] Telnet transmits all information including usernames and passwords in plaintext so it is not recommended for security-sensitive applications such as remote management of routers.[3][5] Telnet's use for this purpose has waned significantly in favor of SSH.[6] Some extensions to Telnet which would provide encryption have been proposed.[7]

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