【说明】
某单位采用Windows操作系统配置 DNS服务器，根据配置回答下列问题。
【问题3 】 (4分）
图 2-3 为在DNS服务器上使用nslookup进行测试的相关结果，命令"server 127.0.0.1"的作用是（9），由该图可以得出下列选项说法错误的是（10）。
（10）备选答案：
A.域名www.ruankao.com能被正常解析为192.168.10.80
B.该域名服务器的PTR工作不正常
C.域名ftp.ruankao.com对应的IP地址为192.168.10.21
D.在DNS服务器上是可以进行DNS相关记录是否工作正常的测试
正确答案及解析
正确答案
解析
（9）指明由本机作为DNS服务器来进行解析
（10）B
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