Re: Primary vs. Secondary

Tech-Archive recommends: Repair Windows Errors & Optimize Windows Performance

From: Kevin D. Goodknecht Sr. [MVP] (admin_at_nospam.WFTX.US)
Date: 10/01/04 

Date: Fri, 1 Oct 2004 07:22:25 -0500

In news:215501c4a7ad$11e38240$a401280a@phx.gbl,
fenton@discussions.microsoft.com <fenton@discussions.microsoft.com>
commented
Then Kevin replied below:
> Ace,
>
> Thanks for your detailed answer. However, I guess I
> didn't word the question correctly. What I was trying to
> ask is that according to RPC standard, a domain needs to
> have at least 2 nameservers hosting the zone - one
> primary and one secondary. The secondary is usually sync
> to the primary copy by zone transfer. So, if the dns
> trying to query for an ip, the root nameserver would
> return all the authoritative nameservers. And now, would
> the dns always query the primary nameserver first, or
> just any nameserver on the list, or would it send a
> request to all nameservers? Hope that clears my question
> up a bit.

I think it does, actually you have to understand how recursive queries work,
on how it gets to the authoritative servers for a domain. The root servers
send a list of TLD DNS servers, depending on the TLD your domain is in. The
order is done with round robin, Then the TLD servers send a list of DNS
servers for your domain, with the order select by round robin. So to answer
your question, it is up to the particular resolving DNS server to decide
which DNS server will get queried first, the order would be random and
irrelevant if all your DNS servers answer with authority. 

-- 
Best regards,
Kevin D4 Dad Goodknecht Sr. [MVP]
Hope This Helps
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