1 © 2003, Cisco Systems, Inc. All rights reserved. CCNA 2 v3.0 Module 4 Learning About Other Devices

222 © 2003, Cisco Systems, Inc. All rights reserved. Objectives Discovering and connecting to neighbors Getting information about remote devices

333 © 2003, Cisco Systems, Inc. All rights reserved. Cisco Discovery Protocol (CDP) CDP is media and protocol independent, and runs on all Cisco equipment over the Subnetwork Access Protocol (SNAP).

444 © 2003, Cisco Systems, Inc. All rights reserved. Showing CDP Neighbor Entries

555 © 2003, Cisco Systems, Inc. All rights reserved. Implementation, Monitoring, and Maintenance of CDP

666 © 2003, Cisco Systems, Inc. All rights reserved. The show cdp interface Command

777 © 2003, Cisco Systems, Inc. All rights reserved. The show cdp neighbors Command

888 © 2003, Cisco Systems, Inc. All rights reserved. Creating a Network Map The show cdp neighbors [type number] [detail] command can be used to obtain the following: Device ID — Address Port ID — Capabilities Version — Platform IP network prefix VTP management domain name (CDPv2 only) Native VLAN (CDPv2 only) Full/Half duplex (CDPv2)

999 © 2003, Cisco Systems, Inc. All rights reserved. Disabling CDP

10 © 2003, Cisco Systems, Inc. All rights reserved. Troubleshooting CDP

11 © 2003, Cisco Systems, Inc. All rights reserved. Telnet

12 © 2003, Cisco Systems, Inc. All rights reserved. Telnet Operations

13 © 2003, Cisco Systems, Inc. All rights reserved. Establishing Telnet Connections A host name table or access to DNS for Telnet must be present for a name to work. Otherwise, the IP address of the host must be entered. Denver>connect paris Denver>paris Denver> Denver>telnet paris Telnet can be used to perform a test to determine whether access can be obtained from a remote router.

14 © 2003, Cisco Systems, Inc. All rights reserved. Telnet Operations

15 © 2003, Cisco Systems, Inc. All rights reserved. Advanced Telnet Operation Multiple Telnet sessions can be used and suspended by using the Ctrl+Shift+6 and x sequence.

16 © 2003, Cisco Systems, Inc. All rights reserved. Testing with the ping Command

17 © 2003, Cisco Systems, Inc. All rights reserved. Testing with the traceroute Command

18 © 2003, Cisco Systems, Inc. All rights reserved. Troubleshooting IP Addressing Issues