RFC 1034:DOMAIN NAMES - CONCEPTS AND FACILITIES
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AA

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6. A SCENARIO
... +---------------------------------------------------+ Header | OPCODE=SQUERY, RESPONSE, AA | +---------------------------------------------------+ Question | QNAME=SRI-NIC ...
... bit is set, indicating that this message is a response, not a query, and the Authoritative Answer (AA) bit is set indicating that the address ...
... This response is different from the previous one in two ways: the header does not have AA set, and the TTLs are different. The inference is that the data did not come from a zone, but from a cache ...
... +---------------------------------------------------+ Header | OPCODE=SQUERY, RESPONSE, AA | +---------------------------------------------------+ Question | QNAME=SRI-NIC ...
... Neither of these answers have AA set, so neither response comes from authoritative data. The different contents and different TTLs suggest ...
... +---------------------------------------------------+ Header | OPCODE=SQUERY, RESPONSE, AA | +---------------------------------------------------+ Question | QNAME=SRI-NIC ...
... +---------------------------------------------------+ Header | OPCODE=SQUERY, RESPONSE, AA | +---------------------------------------------------+ Question | QNAME=SRI-NIC ...
... The only difference between the response and the query is the AA and RESPONSE bits in the header ...
... +---------------------------------------------------+ Header | OPCODE=SQUERY, RESPONSE, AA, RCODE=NE | ...
... +---------------------------------------------------+ Header | OPCODE=SQUERY, RESPONSE, AA | +---------------------------------------------------+ Question | QNAME=USC-ISIC.ARPA ...
... Note that the AA bit in the header guarantees that the data matching ...
... +---------------------------------------------------+ Header | OPCODE=SQUERY, RESPONSE, AA | +---------------------------------------------------+ Question | QNAME=USC-ISIC.ARPA ...
... +---------------------------------------------------+ Header | OPCODE=SQUERY, RESPONSE, AA | +---------------------------------------------------+ Question | QNAME=USC-ISIC.ARPA ...
... +---------------------------------------------------+ Header | OPCODE=SQUERY, RESPONSE, AA | +---------------------------------------------------+ Question | QNAME=ISI.EDU., QCLASS=IN ...
... +---------------------------------------------------+ Header | OPCODE=SQUERY, RESPONSE, AA | +---------------------------------------------------+ Question | QNAME=65.0.6.26.IN-ADDR.ARPA ...

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