An engineer configures interface Gi1/0 on the company PE router to connect to an ISP. Neighbor discovery is disabled. Which action is necessary to complete the ...

An engineer configures interface Gi1/0 on the company PE router to connect to an ISP. Neighbor discovery is disabled. Which action is necessary to complete the configuration if the ISP uses third-party network devices?

A. Disable autonegotiation. B. Enable LLDP globally. C. Enable LLDP-MED on the ISP device. D. Disable Cisco Discovery Protocol on the interface.