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
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.
I am not sure if this answer is correct. From R2’s perspective, s1 and s2 and r1 and r3 would be considered directly connected. And therefore would respond back successfully. All next hops on a router must be directly connected, or else they can not be next hops.