secondary DNS server is meaningful?

[Mark Damrose]

"SB CH" <chulmin2 at hotmail.com> wrote in message
news:aqpl39$80s2$1 at isrv4.isc.org...
>
> Hello all.
>
> I would like to know the rule of the secondary DNS.
> secondary DNS is just backup?

No.  All servers are used - roughly equally.

> so it is useless to operate secondary DNS if primary DNS is operated well?
> But some case, a domain is not resolved properly when setup at just
primary
> DNS server.
> So I guess that the primary and secondary is important alike, right?
> I woule like to know the real role of the secondary DNS.
> just backup or not?
>
> Thanks in advance.
>
>
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