Which WAN service utilizes two different encapsulation types (one for data and one for signaling) on its data link layer?（）
- A、ISDN
- B、Frame Relay
- C、ATM
- D、FDDI
正确答案:A
答案解析:有
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Which WAN service utilizes two different encapsulation types (one for data and one for signaling) on its data link layer?（）
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