A.naned.checkconf /var/named.confB.named-checkconf /etc/named.confC.named.checkzone /etc/named.confD.named-checkzone /etc/named.conf
A.0.0.0.0B.255.255.255.255C.anyD.any;
A.hosts文件B.本地DNS緩存C.tcp/ip配置的首選DNS服務(wù)器D.DNS根服務(wù)器