DNS

SOA record

Start of Authority — one per zone, carrying the primary nameserver name, the responsible contact, the serial number, and the timers that govern secondary refresh and negative caching.

Defined in RFC 1035 §3.3.13.

Where this appears

The lessons that use this term, and what each is for.

Domain Security FundamentalsThe records worth knowing, field by fieldRead a zone’s SOA, NS, A, CNAME, MX, TXT and CAA records and say what each asserts.DNS Security PractitionerHow a secondary stays currentDescribe the transfer mechanism a secondary uses and how it is authenticated.