Telnet

<p>Telnet (sometimes stylized TELNET) is a <a href="/facts/Client%E2%80%93server_model/FSnf27C5">client-server</a> <a href="/facts/Application_layer/FAFhLruA">application protocol</a> that provides access to virtual <a href="/facts/Computer_terminal/fSlx05qV">terminals</a> of <a href="/facts/Remote_system/sPIwCm1S">remote systems</a> on <a href="/facts/Local_area_network/edUDxJ6J">local area networks</a> or the <a href="/facts/Internet/Xw1rVvJU">Internet</a>. It is a protocol for bidirectional 8-bit communications. Its main goal was to connect terminal devices and terminal-oriented processes.
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The name "Telnet" refers to two things: a protocol itself specifying how two parties are to communicate and a software application that implements the protocol as a service. User data is interspersed <a href="/facts/In-band_signaling/KAgeV09X">in-band</a> with Telnet control information in an 8-bit <a href="/facts/Byte_oriented/FXd1gTfC">byte oriented</a> data connection over the <a href="/facts/Transmission_Control_Protocol/WW4sPrt9">Transmission Control Protocol</a> (TCP). Telnet transmits all information including usernames and passwords in plaintext so it is not recommended for security-sensitive applications such as <a href="/facts/Remote_monitoring_and_management/utlx3F8y">remote management</a> of routers. Telnet's use for this purpose has waned significantly in favor of <a href="/facts/Secure_Shell/wjVRw5zv">SSH</a>. Some extensions to Telnet which would provide encryption have been proposed.</p>

Telnet open-in-new

Telnet