200-301 Question 203
Single answerYou are configuring a network for a small office. The network uses both Cisco and non-Cisco devices. You want to enable a Layer 2 discovery protocol to allow devices to share information such as hostname, port details, and capabilities. However, some devices in the network do not support Cisco Discovery Protocol (CDP). After enabling the chosen protocol on the switches, how can you verify that it is functioning correctly?
- A
Use the command 'show cdp neighbors' on the Cisco switch.
- B
Use the command 'show lldp neighbors' on the Cisco switch.
- C
Run the command 'show interfaces' to verify the protocol is active on all interfaces.
- D
Check the MAC address table using the 'show mac address-table' command.
Show answer and explanation
Correct answer: B
Explanation
Since the network includes non-Cisco devices, LLDP is the appropriate Layer 2 discovery protocol to use as it is vendor-neutral. The command 'show lldp neighbors' allows you to verify that LLDP is enabled and functioning correctly by displaying information about directly connected devices that support LLDP.
- A. Incorrect.
This option is incorrect because 'show cdp neighbors' is specific to Cisco Discovery Protocol (CDP), which is not supported by all devices in the scenario.
- B. Correct.
This option is correct because 'show lldp neighbors' is the appropriate command to verify Link Layer Discovery Protocol (LLDP), which is designed to work across both Cisco and non-Cisco devices.
- C. Incorrect.
This option is incorrect because 'show interfaces' displays interface details but does not verify the operation of discovery protocols like LLDP or CDP.
- D. Incorrect.
This option is incorrect because the MAC address table lists learned MAC addresses but does not provide details related to Layer 2 discovery protocols.