Re: Primary vs. Secondary

From: Fenton (fenton_at_no-email.com)
Date: 10/01/04 

Date: Fri, 1 Oct 2004 16:23:02 -0500

Thanks kevin,

Just wondering since the DNS will randomly select the all Nameservers for
query, (including the primary and all the secondarys), so, is putting an
EXTRA "not-as-reliable" secondary nameserver a good idea? On one hand, it
creates some extra redundancy. However, on the other hand, there are
chances for it to be picked randomly while it is offline and hence delay the
query.

Any suggestion?
Fenton

"Kevin D. Goodknecht Sr. [MVP]" <admin@nospam.WFTX.US> wrote in message
news:ewdsRF7pEHA.3524@TK2MSFTNGP15.phx.gbl...
> 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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