Servidores DNS Principal (mname) y Secundario (rname)
host: com.cu
class: IN
ttl: 3600
type: SOA
mname: ns.ceniai.net.cu
rname: cu-tech.ceniai.inf.cu
serial: 2026022300
refresh: 3600
retry: 900
expire: 1209600
minimum-ttl: 3600