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Cisco Certified Network Associate (CCNA) · Cisco
Select one answer.
Written by other learners. Comments can disagree with the marked answer — check the official documentation when in doubt.
To support neighbor discovery with third-party devices, you should enable LLDP (Link Layer Discovery Protocol), which is an open-standard protocol for network device discovery. Answer is A
I have no idea why D is the most highly rated. In an environment with third party routers you will want to enable lldp globally as the next step.
A is correct