Terminal Network (TELNET)

TELNET is a flexible client-server program designed to allow users to access application programs on a remote computer. It enables users to remotely log in to a system, use the available services on that system, and transfer the obtained results back to their local computer.


Functionality and NVT System:

Using the Network Virtual Terminal (NVT) system, TELNET translates characters on the local system. On the remote server, NVT interprets these characters in a format that the remote machine can understand.

TELNET protocol model

TELNET, functioning as a protocol, provides a comprehensive, two-way communication facility oriented around eight-bit bytes. Several application protocols are constructed on top of the TELNET protocol, with TELNET being an abbreviation for "Terminal Network."

 

Connection Establishment and Virtual Terminal:

TELNET facilitates the establishment of a connection to a remote system, presenting the local terminal as if it were a terminal on the remote system. An integral component is the Virtual Terminal in TELNET:

  • The TELNET client translates the output from the physical terminal into standard code.
  • The standard code is then transmitted to the TELNET server on the remote host.
  • The TELNET server interprets this information into characters acceptable to the remote host, establishing a connection to a virtual terminal.

 

Local and Remote Login:

  • Local Login: When a user logs into a local time-sharing system, it is referred to as a local login.
  • Remote Login: Users seeking access to an application program or utility on a remote machine engage in remote login. The TELNET client and server programs play a crucial role in facilitating seamless remote connections, addressing the challenge of connecting multiple incompatible terminals to a single remote server.

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