Computer History Notes - Herong's Tutorial Notes - v3.12, by Dr. Herong Yang
What Is Telnet
This section provides a quick introduction of Telnet application that allows you to log into a remote computer over the Internet as a text based terminal.
What Is Telnet? - Telnet is an Internet application that allows you to log into a remote computer over the Internet as a text based terminal.
The Telnet protocol that supports the Telnet application was actually developed on physical networks before the Internet age. The Telnet protocol was proposed by C. Stephen Carr in 1969 in "RFC 15 - Network Subsystem for Time Sharing Hosts" at https://tools.ietf.org/html/rfc15.
The diagram below from the above RFC shows how a user from University of Utah can establish a terminal access to the computer host at Standford Research Institute:
Teletype Terminal ______ ________ _________ | | ______ ______ | | | | | USER | | | | | |SERVING | | |-----| HOST |----| |---//---| |---| HOST | |_________| | A | | | | | | B | |______| |______| |______| |________| University Stanford of Utah Research Institute Figure 1: User accesses distant serving HOST via shunt subsystem in his own Host computer.
As of today, Telnet is still supported on many computer systems. Here is an example of Telnet session (Source: stackexchange.com):
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