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Refer to the exhibit. The command "show cdp neighbors" is issued on Router R2. If all interfaces and devices have CDP enabled which devices will be shown in the output of the command?
R1 and SW2
All devices
SW2
R1
R1, R2 and R3
R2
Cisco Discovery Protocol (CDP) is a Layer 2 Cisco proprietary protocol used to find Cisco neighbor devices and learn about their type of hardware, software version, and active interfaces. CDP can be used by a L2 or L3 device. Theshow cdp neighbors delivers information about directly connected devices. Since R2 has only two physically attached devices and all devices have CDP enabled. Only R1 and SW2 will be displayed in the output of the command. CDP packets are not forwarded by Cisco Switches, it is only possible to see what is directly connected.
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