Which one of the WAN data-link protocols below is used for out-of-band signaling?（）
- A、HDLC
- B、NCP
- C、PAP
- D、LAPD
- E、LAPB
- F、None of the above
正确答案:D
答案解析:有
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Which one of the WAN data-link protocols below is used for out-of-band signaling?（）
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