Servidores DNS Principal (mname) y Secundario (rname)
host: cch-naucalpan.unam.mx
class: IN
ttl: 7200
type: SOA
mname: ns1.unam.mx
rname: dns.unam.mx
serial: 2025020400
refresh: 3600
retry: 1200
expire: 604800
minimum-ttl: 7200