Cisco 100-105 Exam

Refer to the exhibit. If CDP is enabled on all devices and interfaces, which devices will appear in the output of a show cdp neighbors command issued from R2?

If CDP is enabled on all devices and interfaces, which devices will appear in the output of a show cdp neighbors command issued from R2?

  • A. R1, S1, S2, R3 and S3
  • B. R2 and R3
  • C. R3 and S2
  • D. R1 and R3
  • E. R1, S1, S2, and R3
Answer: Option C.
Explanation: 

A Cisco device enabled with CDP sends out periodic interface updates to a multicast address in order to make itself known to neighbors. Since it is a layer two protocol, these packets are not routed. So the devices detected would be immediate connected neighbors.

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