Servidores DNS Principal (mname) y Secundario (rname)
host: topsy.com
class: IN
ttl: 3600
type: SOA
mname: usmsc2-extxfr-001.dns.apple.com
rname: hostmaster.apple.com
serial: 42
refresh: 1800
retry: 900
expire: 2419200
minimum-ttl: 1800
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