多选题What are some common layer 2 encapsulations for a WAN link?（）AEthernetBPPPCToken RingDHDLCEFrame RelayFPOTS
多选题
What are some common layer 2 encapsulations for a WAN link?（）
A
Ethernet
B
PPP
C
Token Ring
D
HDLC
E
Frame Relay
F
POTS
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