What are two reasons a network administrator would use CDP? (Choose two.)

A.
to obtain VLAN information from directly connected switches.

B.
to determine the status of network seivices on a remote device.

C.
to determine the status of the routing protocols between directly connected routers .

D.
to verify the type of cable interconnecting two devices.

E.
to verify Layer 2 connectivity between two devices when Layer 3 fails.

F.
to obtain the IP address of a connected device in order to telnet to the device.

Explanation:
Cisco Discovery Protocol (CDP) is primarily used to obtain protocol addresses of neighboring devices and discover the platform of those devices. CDP can also be used to show information about the interfaces your router uses. CDP is an independent media protocol and runs on all Cisco-manufactured devices including routers, bridges, access servers, and switches. It should be noted that CDP is a protocol which works on the Iayer2. By default, multicast advertise is sent every 60 seconds to 01-00-0 c-cc-cc-cc as the destination address . When reaching the holdtime of 180 seconds , if not receiving the advertise from neighboring devices yet, the information of neighboring devices will be cleared.

Cisco Discovery Protocol (CDP) is a proprietary protocol designed by Cisco to help administrators collect information about both locally attached and remote devices. By using CDP, you can gather hardware and protocol information about neighbor devices, which is useful info for troubleshooting and documenting the network.

You can use:
Showcdp neighbor Show cdp neighbor details
Commands to gather the information of connected neighbors.