Understanding Telnet Speaking and Writing Homework

1. Understanding Telnet
Telnet
NVT(Network Virtual Terminal)
Printer
Terminal Emulation

2. Telnet
elnet is a netwTork protocol used on the Internet or local area networks to
provide a bidirectional interactive communications facility.
Typically, telnet provides access to a command-line interface on a remote
host via a virtual terminal connection which consists of an 8-bit byte oriented
data connection over the Transmission Control Protocol . User data is
interspersed in-band with TELNET control information.

3. NVT(Network Virtual Terminal)
The Network Virtual Terminal (NVT) is a bi-directional character device. The NVT
has a printer and a keyboard. The printer responds to incoming data and the
keyboard produces outgoing data which is sent over the TELNET connection
and, if "echoes" are desired, to the NVT's printer as well. "Echoes" will not be
expected to traverse the network. The code set is seven-bit USASCII in an
eight-bit field, except as modified herein. Any code conversion and timing
considerations are local problems and do not affect the NVT.

4. Printer
A printer is a peripheral which produces a hard copy of documents stored in
electronic form, usually on physical print media such as paper or transparencies.
Many printers are primarily used as local peripherals, and are attached by
a printer cable or, in most newer printers, a USB cable to a computer which
serves as a document source. Some printers, commonly known as network
printers, have built-in network interfaces, and can serve as a hardcopy device
for any user on the network. Individual printers are often designed to support
both local and network connected users at the same time.

5. Terminal Emulation
Terminal Emulation is a program that emulates a "dumb" video terminal within some
other display architecture. Though typically synonymous with a command line shell
or text terminal, the term terminal covers all remote terminals, including graphical
interfaces. A terminal emulator inside a graphical user interface is often called a
terminal window.

6. References
http://en.wikipedia.org/wiki/
http://www.freesoft.org/CIE/RFC/854/3.htm
http://images.google.co.jp/