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Sometimes network administrators are
faced with situations where network documentation is incomplete or
inaccurate. Cisco Discovery Protocol (CDP) can be a useful tool in
these situations because it can help to build a basic picture of
the network. CDP is a media and protocol independent, Cisco
proprietary protocol used for neighbor discovery. CDP will
only show information about directly connected neighbors but it is
nevertheless a powerful tool.
In many cases after a router is
initially configured it is difficult or inconvenient for a network
administrator to connect directly to the router for configuration
changes or other activities. Telnet is a TCP/IP-based application
that allows remote connection to the router command-line interface (CLI) for configuration, monitoring, and
troubleshooting purposes. It is an essential tool for the network
professional.
Students completing this module should be able to:
- Enable and disable CDP
- Use the
show cdp neighbors
command
- Determine which neighboring
devices are connected to which local interfaces
- Gather network address
information about neighboring devices using CDP
- Establish a Telnet connection
- Verify a Telnet connection
- Disconnect from a Telnet session
- Suspend a Telnet session
- Perform alternative connectivity
tests
- Troubleshoot remote terminal
connections
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