Definition - Authoritative

A DNS server is said to be authoritative for a domain name when it hosts the DNS records for that domain name.

An authoritative DNS server for a domain name is configured with a local DNS zone for the domain name and its sub-names.

Both the primary and the secondary DNS servers for a domain name are considered authoritative.

An authoritative DNS server for a domain name responds with "Authoritative Answers" for the domain - as indicated by the "AA" header flag set in responses.

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