Servidores DNS Principal (mname) y Secundario (rname)
host: etecsa.net
class: IN
ttl: 2000
type: SOA
mname: ns3.etecsa.net
rname: admin.enet.cu
serial: 2025122737
refresh: 7200
retry: 1800
expire: 1209600
minimum-ttl: 2000

Servidor de Correo
host: etecsa.net
class: IN
ttl: 2000
type: MX
pri: 0
target: mail.etecsa.net