Symptom:

Adjective describing a name server or a response from a name server that is referencing its own native data. The authoritative server contains an entire copy of the zone that is derived from local configuration data, possibly with the help of another authoritative name server for the zone. Data is obtained without the need for caches or the help of any resolver. A server can be authoritative about one zone but not authoritative for another.

Solution

See also:
Caching
Delegation
SOA Record