Start of Authority (SOA) Records
The Start of Authority (SOA) record in a DNS database indicates which server is authoritative for that particular zone. The server referenced by the SOA records is subsequently the server that is assumed to be the authoritative source of information about a particular zone and is in charge of processing zone updates. The SOA record contains information such as the Time-to-Live (TTL) interval, the contact person responsible for DNS, and other critical information, as illustrated in Figure 10.3.
Figure 10.3. A sample SOA record.
An SOA record is automatically created when DNS is installed for AD DS in Windows Server ...
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