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In page Telnet:

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The telnet protocol is a client-server protocol that runs on a reliable connection-oriented transport.[citation needed] Most often, a telnet client connects over TCP to port 23 or 2323, where a Telnet server application is listening.[1][2][3] The Telnet protocol abstracts any terminal as a Network Virtual Terminal (NVT). The client must simulate a NVT using the NVT codes when messaging the server.