转至 
C:\Documents and Settings\zhangc>nslookup
DNS request timed out.
timeout was 2 seconds.
*** Can't find server name for address 172.16.77.6: Timed out
*** Default servers are not available
Default Server: UnKnown
Address: 172.16.77.6
原因:DNS客户机默认DNS服务器填写不正确或没有填写,应检查客户机DNS指向是否正确
C:\Documents and Settings\zhangc>nslookup asd.zc.com.cn
Server: dns.zc.com.cn
Address: 172.16.77.77
*** dns.zc.com.cn can't find asd.zc.com.cn: Non-existent domain
原因:DNS服务器中没有这条记录(无法找到要解析的记录),应检查A记录在创建时主机名是否正确
C:\Documents and Settings\zhangc>nslookup
Server: dns.zc.com.cn
Address: 172.16.77.77
DNS request timed out.
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
*** Request to dns.zc.com.cn timed-out
原因:客户机向DNS服务器解析了一个非DNS服务器所管辖区域的域名,所以DNS服务器应采取寻树或转发的方式帮助客户机解析域名,返回这种结果代表服务器无法联系到其他的DNS服务器(无法寻树或向转发服务器发送请求),应检查服务器网络连通性。
C:\Documents and Settings\zhangc>nslookup
*** Can't find server name for address 172.16.77.77: Non-existent domain
*** Default servers are not available
Default Server: UnKnown
Address: 172.16.77.77
原因:DNS服务器PTR记录错误或没有创建
C:\Documents and Settings\zhangc>nslookup
DNS request timed out.
timeout was 2 seconds.
*** Can't find server name for address 172.16.77.77: Timed out
*** Default servers are not available
Default Server: UnKnown
Address: 172.16.77.77
原因:DNS服务器反向区域错误或没有创建
> 172.16.77.11
Server: dns.zc.com.cn
Address: 172.16.77.77
*** dns.zc.com.cn can't find 172.16.77.11: Non-existent domain
原因:服务器无法找到这条记录(PTR)

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