Cisco CCNA mock exam questions sample test – Question 13

.Which Cisco IOS Cisco Discovery Protocol (CDP) command displays the IP address of the directly connected Cisco devices?

A. show cdp
B. show cdp devices
C. show cdp traffic
D. show cdp neighbors detail

Correct Answer: D

Explanation:
The show cdp neighbors detail command displays the IP address of the directly connected Cisco devices. CDP is a Layer 2 (Data Link layer) protocol that finds information about
neighboring network devices. CDP does not use Network layer protocols to transmit information because it operates at the Data Link layer. For this reason, IP addresses need not
even be configured on the interfaces for CDP to function. The only requirement is that the interfaces be enabled with the no shutdown command. An example of the output of the show
cdp neighbors detail command is as follows:
The show cdp devices command is incorrect because this is not a valid Cisco IOS command.
The show cdp command is incorrect because this command is used to view the global CDP information. It lists the default update and holdtime timers, as in the following sample
output:
Atlanta# show cdp
Global CDP information:
Sending CDP packets every 60 seconds
Sending a holdtime value of 180 seconds
Sending CDPv2 advertisements is enabled
The show cdp traffic command is incorrect because this command displays traffic information between network devices collected by the CDP, as in the following example:
Birmingham# show cdp traffic
Total packets output: 652, Input: 214
Hdr syntax: 0, Chksum error: 0, Encaps failed: 0
No memory: 0, Invalid: 0, Fragmented: 0
CDP version 1 advertisements output: 269, Input: 50
CDP version 2 advertisements output: 360, Input: 25

Objective:
Infrastructure Management
Sub-Objective:
Use Cisco IOS tools to troubleshoot and resolve problems
References:
Cisco > Cisco IOS Network Management Command Reference > schema through show event manager session cli username > show cdp neighbors detail