Step 1: Confirm the Network Diagrams Using CDP

The Cisco Discovery Protocol (CDP) helps you verify the information in the network diagram and to complete the rest of the necessary information about the devices and topology. In real life, the network diagrams can be old and outdated, and a problem might be caused because someone moved some cables and did not update the diagrams. I doubt that Cisco would write a question with purposefully inaccurate information in the figure, but the exam might easily include questions for which the network diagram does not list all the required information, and you need to use CDP to find the rest of the details. So, this section reviews CDP, and a good first LAN data plane troubleshooting step is as follows: ...

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