【多选题】
What are two reasons a network administrator would use CDP? （）
A、to verify the type of cable interconnecting two devices
B、to determine the status of network services on a remote device
C、to obtain VLAN information from directly connected switches
D、to verify Layer 2 connectivity between two devices when Layer 3 fails
E、to obtain the IP address of a connected device in order to telnet to the device
F、to determine the status of the routing protocols between directly connected routers
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