ICND1 – CDP & LLDP
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Premium Member: You can test your knowledge with these questions first via this link.
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Question 1
[am4show have=’p2;’]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?
A. R2 and R3
B. R1 and R3
C. R3 and S2
D. R1, S1, S2, and R3
E. R1, S1, S2, R3, and S3
Answer: C[/am4show]
Explanation
CDP runs at Layer 2 so it can recognize a switch (if that switch also runs CDP).
Question 2
[am4show have=’p2;’]On a Cisco switch, which protocol determines if an attached VoIP phone is from Cisco or from another vendor?
A. RTP
B. TCP
C. CDP
D. UDP
Answer: C[/am4show]
Explanation
Cisco Discovery Protocol (CDP) is a proprietary protocol of Cisco so if you can see the VoIP phone via the “show cdp neighbors” command on a Cisco switch then that phone is from Cisco.
Question 3
[am4show have=’p2;’]At which layer of the OSI model does the protocol that provides the information that is displayed by the show cdp neighbors command operate?
A. application
B. transport
C. network
D. physical
E. data link
Answer: E[/am4show]
Explanation
CDP runs at Layer 2 (Data Link) of the OSI model -> E is correct.
Question 4
[am4show have=’p2;’]Refer to the exhibit. For security reasons, information about RTA, including platform and IP addresses, should not be accessible from the Internet. This information should, however, be accessible to devices on the internal networks of RTA. Which command or series of commands will accomplish these objectives?
A – RTA(config)#no cdp run
B – RTA(config)#no cdp enable
C – RTA(config)#interface s0/0
RTA(config-if)#no cdp run
D – RTA(config)#interface s0/0
RTA(config-if)#no cdp enable
Answer: D[/am4show]
Question 1, Can somebody further explain the reason the answer giving pls.
Is is because R3 and S2 are directly connected to R2?
Yes, you are correct R3 and S2 are directly connected and the reason is that CDP is a data link layer 2 protocol that gives more detail through the switch. Where as the router will show only the most directly connected.
I cant see the questions only explanation? Can anyone help?