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