CCNA Cisco Certified Network Associate Study Guide - FTP Server

Using Telnet
Using Telnet 351
Encapsulation ARPA
Sending CDP packets every 60 seconds
Holdtime is 180 seconds
Serial1 is administratively down, line protocol is down
Encapsulation HDLC
Sending CDP packets every 60 seconds
Holdtime is 180 seconds
Router#
Notice in the output above that serial 0 does not show up in the router
output.
Telnet is a virtual terminal protocol that is part of the TCP/IP protocol
suite. Telnet allows you to make connections to remote devices, gather information,
and run programs.
After your routers and switches are configured, you can use the Telnet
program to configure and check your routers and switches so that you don’t
need to use a console cable. You run the Telnet program by typing telnet
from any command prompt (DOS or Cisco). VTY passwords must be set on
the routers for this to work.
You cannot use CDP to gather information about routers and switches
that are not directly connected to your device. However, you can use the Telnet
application to connect to your neighbor devices and then run CDP on
those remote devices to gather CDP information about remote devices.
You can issue the telnet command from any router prompt, as in the following
example:
Todd2509#telnet 172.16.10.2
Trying 172.16.10.2 ... Open
Password required, but none set
[Connection to 172.16.10.2 closed by foreign host]
Todd2509#