What are some common layer 2 encapsulations for a WAN link?（）A、EthernetB、PPPC、Token RingD、HDLCE、Frame RelayF、POTS
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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