SOA
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SOA stand for Start Of Authority and is used in DNS network configuration files for named using Standard Resource Records to mark beginning of zone data. A typical SOA record looks like
@ IN SOA somehost.somedomain.sometld. username.somehost.somedomain.sometld. (
12345 ; serial
720000 ; refresh every 200 hours
1800 ; retry after 30 minutes
7200000 ; expire after 2000 hours
900 ; negative cache is 15 minutes
)