多选题Which three Layer 2 encapsulation types would be used on a WAN rather than a LAN? (Choose three.)（）AHDLCBEthernetCToken RingDPPPEFDDIFFrame Relay
多选题
Which three Layer 2 encapsulation types would be used on a WAN rather than a LAN? (Choose three.)（）
A
HDLC
B
Ethernet
C
Token Ring
D
PPP
E
FDDI
F
Frame Relay
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