Tim:
>> The internet, at large, will always use your primary server.  If it
>> can't, it'll try your secondary server.

Ed Greshko:
> I'm not certain what you mean by the use of "primary" in that
> statement.  But I don't think it is actually accurate in any event.

It's probably an out-of-date concept, now.  When I registered my
domain, years ago, they referred to their name servers as primary and
secondary.

Most services will have several DNS servers.  They may consider one of
theirs the best, since for some reason it's faster, or bigger, or runs
on better hardware if they didn't build identical systems, or they
configure their network to favour it.  ISPs were like that.  They'd
tell you to use /this/ one preferentially.

Or, it could be that what they call their "primary" one is the one that
you're allowed to enter your data into, and the other(s) will extract
your data from their main one.

In any case, the message really is that you should have multiple DNS
servers, ones that you don't have to run yourself.

It was always recommended that you have at least two.  But you often
see some major sites will have at least four name servers.  Though I've
seen a few comments that there's little point in having massive
redundancy in answer DNS queries about you, but only one webserver
hosting your site.

-- 
 
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