Determining Which Authoritative Sever to Use

[Bob McDonald]

Forgive my ignorance if this is a trivial question.

Supposing I have an internal IP network (rfc1918)  where there atr local
caching servers (recursive) which clients connect to and scattered around
are several authoritative servers  which provide answers for internal only
zones. Those internal only zones are defined on the caching servers via
stub zones.

My question is this; how do the recursive servers determine from
the information in the stub zone which name server to query? And, is that
the closest (network wise)? Do I need to put anycast into the mix?

TTFN,

Bob
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