下列命令中，不能用于诊断DNS故障的是（ ）。
- A.netstat
- B.nslookup
- C.ping
- D.tracert
正确答案及解析
正确答案
解析
netstat是控制台命令，是一个监控TCP/IP网络的非常有用的工具，它可以显示路由表、实际的网络连接以及每一个网络接口设备的状态信息。netstat用于显示与IP、TCP、UDP和ICMP协议相关的统计数据，一般用于检验本机各端口的网络连接情况。
nslookup是一个监测网络中DNS服务器是否能正确实现域名解析的命令行工具。
PING命令常用于测试连通性，在此过程中可看出是直接ping的目标地址。
nslookup、ping、tracert都可以加上一个主机域名作为其命令参数来诊断DNS故障，nslookup还可以看到本地DNS服务器地址。Arp命令是与arp记录有关，与DNS无关联。
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