Servidores DNS Principal (mname) y Secundario (rname)
host: laboratorioclinicosanitas.org
class: IN
ttl: 3600
type: SOA
mname: nameserver01.mi.com.co
rname: hostmaster.laboratorioclinicosanitas.org
serial: 0
refresh: 10800
retry: 3600
expire: 1209600
minimum-ttl: 3600