Understanding Telnet


          *Use Telnet
             (1,2)


*NVT (Network Virtual Terminal)
             (3)


    *...
Use Telnet
●   What is telnet:Teletype network
    ○ Telnet is a network protocol used on the Internet or local area
     ...
NVT (Network Virtual Terminal)
●   The Telnet is a kind of NVT.

●   The Telnet protocol assumes that each end of the
    ...
How the Telnet Works
   Do you know , typed text in a Telnet session accumulate in a
buffer on your computer ?
   When a c...
The Telnet host works
The Telnet hosts processes the data you've sent.
And it returns to your screen the results of using ...
References

         Google
 http://www.google.co.jp


          Wikipedia
http://ja.wikipedia.org/wiki/
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Week11 F

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Week11 F

  1. 1. Understanding Telnet *Use Telnet (1,2) *NVT (Network Virtual Terminal) (3) *How the Telnet Works (4,5) *The Telnet host works (6,7)
  2. 2. Use Telnet ● What is telnet:Teletype network ○ Telnet is a network protocol used on the Internet or local area networks to provide a bidirectional interactive communications facility. ● First you need to know the Internet address of the host.(want to use) ● When you contact the host ○ Negotiate communicate each other. ○ Decide terminal emulation which will be used. *terminal emulation:how your keybord will transmit information. and how information will be displayed on your screen. ● Terminal emulation example: ○ VT-100 : the most common type ● Quotation by ○ http://www.cisco.com/JP/support/public/mt/tac/100/1001851/pix432. shtml ○ http://en.wikipedia.org/wiki/Telnet
  3. 3. NVT (Network Virtual Terminal) ● The Telnet is a kind of NVT. ● The Telnet protocol assumes that each end of the connection - the client and the server – is a NVT. ● Each NVT has a virtual “printer” and a virtual “keyboard.” ● The keyboard sends data from one NVT to the other. ● The printer is not really a printer at all it receives and displays the data on the computer screen. http://www.hw-group.com/products/io_controller/index_en.html
  4. 4. How the Telnet Works Do you know , typed text in a Telnet session accumulate in a buffer on your computer ? When a complete line of data is ready for transmission or when you give a command to transmit data, the data is sent across the Internet from your NVT keyboard. ● The transmit data such as pressing the Enter key Your IP address is also sent, so that information can be routed back to you. Additionally , specific Telnet commands are sent that the other NVT uses to decide what to do with the data or how to respond to the data. Quoted Image By http://www.nihon-cornet.co.jp/product/patton/model_2120.html
  5. 5. The Telnet host works The Telnet hosts processes the data you've sent. And it returns to your screen the results of using the data or running the command on a distant computer. This action has a delay between the time you send a command and the time you see the results on your computer. Because packets must go through many Internet routers in each direction between your computer and the host. http://www.n-study.com/network/2002/01/telnet.html
  6. 6. References Google http://www.google.co.jp Wikipedia http://ja.wikipedia.org/wiki/

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