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Which one of the WAN data-link protocols below is used for out-of-band signaling?（）

单选题
2022-03-02 11:15
A、HDLC
B、NCP
C、PAP
D、LAPD
E、LAPB
F、None of the above
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正确答案
D
试题解析
标签： CCNA(640-801)
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