Telnet is a terminal emulation program that allows users to connect their PC to a server on a TCP/IP network like the Internet. This enables users to enter commands on the server as if they were directly accessing the server's console. NVT refers to a virtual terminal with keyboard and printer capabilities defined in RFC854. IP addresses distinguish between the network and host portions of an address using a subnet mask. Routers relay data between networks by analyzing network and transport layer protocols to determine the best path for data transfer.

1. Understanding Telnet
About Telnet
About NTV
About IP Address
About Router
Group B
Understanding Telnet – p.1/6

2. About Telnet
• A terminal emulation program for TCP/IP
networks such as the Internet. The Telnet
program runs on your computer and connects
your PC to a server on the network. You can then
enter commands through the Telnet program and
they will be executed as if you were entering
them directly on the server console. This enables
you to control the server and communicate with
other servers on the network. To start a Telnet
session, you must log in to a server by entering a
valid username and password. Telnet is a
common way to remotely control Web servers.
Understanding Telnet – p.2/6

3. About NVT
• NVT stands for Network Virtual Terminal and
has keyboard and printer. It’s device that is
defined by RFC854. Sometime character code
that is used in NVT called "NVT-ASCII".
Understanding Telnet – p.3/6

4. About IP Address
• The IP address distinguishes the side that is near
to network department, LSB (a least significant
bit) in the side that is near to MSB (most
significant bit) as host region. A network
department appoints a network, and a host part
appoints machinery in the network. I use a subnet
mask for distinction of a network department and
the host part. As of 2009, it is address space of 32
bits based on a protocol called IPv4 that it is used
a lot as an IP address. With the spread of Internet,
as for appearing, "an IP address drying up
problem" that an address dried up surfaced as
IPv4 by the end of late years.
Understanding Telnet – p.4/6

5. About Router
• The machinery which relays data playing with
the router on a network in the other networks. I
analyze some protocols of network layer (the
class of the third) and the transport layer (the
class of the fourth) to say by an OSI Reference
Model and transfer. To see the address of the
network layer, I have a course choice function to
judge which course I should transfer through. In
addition, all the data except one’s supporting
protocol cancel it. I call a router corresponding to
plural protocols multi-protocol router.
Understanding Telnet – p.5/6

6. Reference
• http://ja.wikipedia.org/wiki/Wiki
• http://chiebukuro.yahoo.co.jp/
• http://d.hatena.ne.jp/
• http://e-words.jp/
Understanding Telnet – p.6/6