TELNET is a standard TCP/IP protocol that allows a user to access resources on a remote host from their local computer. It works by having a TELNET client program establish a TCP connection to a TELNET server on the destination system, allowing the client to send keystrokes and receive output character-by-character. While it was commonly used to administer network devices, TELNET has disadvantages like lack of graphics, security issues, and mouse support. However, it remains useful for configuring some network devices, participating in online communities that value its retro interface, and recreational uses.

1. TELecommunication
NETwork

2. What is TELNET ?
Standard TCP/IP protocol that runs at
application layer of network.

3. • The TELNET protocol provides s standardized interface,
through which a program on one host ( The TELNET
client) may access the resources of another host ( The
TELNET server) as though the client were a local terminal
connected to the server.

4. What TELNET do ?
• To access the router of
Mumbai (TELNET
server) using PC in
Delhi (TELNET client)
we can use TELNET.

5. A telnet session looks something like this:

6. How does TELNET work ?
• A user is logged in to the local system, and invokes a
TELNET program (the TELNET client) by typing
telnet xxx.xxx.xxx
where xxx.xxx.xxx is either a host name or an IP address.
• The TELNET client is started on the local machine that
client establishes a TCP connection with the TELNET
server on the destination system.

7. • Once the connection has been established, the client
program accepts keystrokes from the user and relays
them, generally one character at a time, to the TELNET
server.

8. TELNET’s current status
• Enterprise networks to access host applications, e.g., on
IBM Mainframes
• Administration of network elements.
• Internet game clubs.
• Mobile data collection applications.
• Collaboration of multiple.

9. Disadvantages:
• Only text and numbers displayed (VT100 , VT220
connection)
• No graphics
• No color
• No mouse ( no menus ,check boxes ,etc)
• No security

10. So What Is It Good For?
• Configuring network
devices:
• What you see above is a
screenshot from ADSL
router.
• this is a thoroughly
modern router with a
Web interface.
• But it also accepts
incoming Telnet
connections from the
local LAN.
•

11. • Participating in
online communities
Telnet’s text-based
nature, and the fact that
a Telnet session often
looks like something
from the early
Seventies, actually
make it ideal for online
communities.

12. And of course, Telnet can also be used for
plain old fun.

13. CONCLUSION:
• TELNET works over TCP/IP network model used to
access remote machine over the internet .
• Machine should have TELNET client program
(Requirement).
• TELNET works through command line to invoke server
type.

14. THANK YOU !
ANY QUESTIONS?

15. BY:
DEEKSHA SHARMA