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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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Which three Layer 2 encapsulation types would be used on a WAN rather than a LAN (Choose three.)()。
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