Tuesday, 4 October 2011

Telnet is short for Telecommunication Network. It is a virtual terminal protocol allowing a user logged on to one TCP/ IP host to access other hosts on network. 
One of the remarkable features of the Internet is the way it lets you use the resources of a distant computer somewhere else in the world. From your own home or office, you can log onto anther computer, issue commands as if you were at that computers keyboard, and then gain access to all the computers resources. You do this with an Internet resource called Telnet. Telnet follows a client / server model, which means that you run a piece of software on your PC (the client) to use the resources of a distant server computer. This distant computer is called the host. 
The host allows many different clients to access its resources at the same time . It is not devoted to a single user. To use Telnet and the host’s resources, you will need to know the address of the Internet host whose resources you want to access. 
You can access many hosts on the Internet by using Telnet. They are all different computers, so many of them do not work or look alike. For example , some might be UNIX-based systems, some might be NT –based computers and others might be Macintoshes. To make things easier, many host use a menu using Telnet, you will have to use terminal emulation. In this way , you make sure your keyboard and monitor function as the host expects . The most common terminal emulation is the VT-100 emulation. Thus , if you use Telnet software , then VT-100 is a safe emulation to use. 
Telnet is the Terminal Emulation protocol. When you start installing and configuring native TCP/IP devices , you are going to need some way to connect to the device to issue its commands. 
Telnet is versatile. You can establish Telnet sessions over the phone . if here is no phone connection and your device is accessible to the Internet , you can establish a Telnet session over the Internet. In any of these situations you can establish a Telnet session with a remote host. 
How Telnet Works? 
To use Telnet , you need to know the address of the host whose resource you want to use . 
Your Telnet client contacts the host using its Internet address. When you cotact the host, 
the different computer and your computer negotiate how they will communicate with eachother. They decide which terminal emulation will be used. Telnet emulation determines how your keyboard will transmit information to the distant computer and how information will be desplayed on your screan. 

 When you give a command transmit data .the data is sent accross the Internet from your NVT keyboard. Along with the data is the host's IP address, which makes sure the packet is sent to the proper location.
Your IP address is also sent so that information can be route back to you. Additionally specific Telnet commands are sent that the other NVT will use to decide what to do with the data, or how to respond to the data. 
Telnet host services the data you have sent. It process the data and returns to your screen, the result of using the data or running the command on a distance computer. Because packets have to go through many Internet routers in each direction between your computer and the host, there may be a delay between the time you send a command and the time you see the result on your won computer screen
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