题目内容
（请给出正确答案）
[单选题]
How are servers able to conduct a simple authentication check using DNS？（)
A.Forward DNS lookup
B.Reverse DNS lookup
C.RARP
D.Nslookup
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题目内容
（请给出正确答案）
如果结果不匹配，请 联系老师 获取答案
题目内容
（请给出正确答案）
A.Forward DNS lookup
B.Reverse DNS lookup
C.RARP
D.Nslookup
如果结果不匹配，请 联系老师 获取答案
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