Week11 F
- 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. 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. 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. 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. 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. References Google http://www.google.co.jp Wikipedia http://ja.wikipedia.org/wiki/