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In the very earliest days of internetworking,
one of the most important problems that computer scientists needed to
solve was how to allow someone operating one computer to access and
use another as if he or she were connected to it locally. The protocol
created to meet this need was called Telnet, and the effort to
develop it was tied closely to that of the Internet and TCP/IP as a
whole. Even though most Internet users today never invoke the Telnet
protocol directly, they use some of its underlying principles indirectly
all the time. Every time you send a piece of e-mail, use FTP to transfer
a file, or load a Web page, you are using technology based on Telnet.
For this reason, the Telnet protocol can made a valid claim to the title
of the most historically important application protocol in TCP/IP.
In this section, I describe the operation
of the Telnet protocol. I begin with an overview and history of the
protocol and a discussion of the standards that define it. I describe
the general operation of Telnet clients and servers and how connections
are made and maintained. I then explain the important concept of the
Network Virtual Terminal (NVT), Telnets protocol commands, and
how interrupts are handled using Telnets special synch function.
I conclude with a detailed look at Telnets options and how they
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The TCP/IP Guide (http://www.TCPIPGuide.com)
Version 3.0 - Version Date: September 20, 2005
© Copyright 2001-2005 Charles M. Kozierok. All Rights Reserved.
Not responsible for any loss resulting from the use of this site.