Name Error
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... An authoritative name error indicating that the name does not
exist.
...
... or a name we have followed due to a CNAME. If the name
is original, set an authoritative name error in the
response and exit. Otherwise just exit.
...
... example, a name server can distribute a TTL along with a name error
indication, and a resolver receiving such information is allowed to
...
... section of a response when that response is authoritative. The SOA must
be that of the zone which was the source of the authoritative data in
the answer section, or name error if applicable. The MINIMUM field of
the SOA controls the length of time that the negative result may be
cached.
...
... A name error (NE). ...
... between host
names and addresses may combine the "name error" and "data not found"
error conditions into a single type of error return, but the general
function should not. One reason for this is that applications may ask
...
... 4. Analyze the response, either:
a. if the response answers the question or contains a name
error, cache the data as well as returning it back to
the client ...
... The ideal answer is one from a server authoritative for the query which
either gives the required data or a name error. The data is passed back
to the user and entered in the cache for future use if its TTL ...