Servidores DNS Principal (mname) y Secundario (rname)
host: csdb.cn class: IN ttl: 7200 type: SOA mname: ns.sdb.ac.cn rname: root.ns.sdb.ac.cn serial: 2018111925 refresh: 10800 retry: 3600 expire: 360000 minimum-ttl: 7200

Servidor de Correo
host: csdb.cn class: IN ttl: 7200 type: MX pri: 10 target: mx.cstnet.cn


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