Simple question.

Stefan Probst stefan.probst at opticom.v-nam.net
Fri Jul 28 11:00:39 UTC 2000


At 00:49 28.07.00 EDT, you wrote:
-------------------------
> 
> 
> > When a host on network A looks up a site on domain B and the data is
> > not already cached. What is the path the request will make to get
> > the answer? Will it go clear up to the root servers and trail down
> > from there?
> 
> It depends somewhat on the configuration of the local server
> infrastructure, but sooner or later yes, that's what happens.
> 
> DNS is hierarchical down the path, but not up. If the answer to a query
> is not below the current server's authoritative position in the
> hierarchy, then it has to go all the way back to the root and start
> working down the proper path. This is true even if the query domain is
> only one level back in the tree.
> 

OK, risking another red face ;-) :
What's then the purpose of a record like

@  IN NS  some.nameserver.tld

To find that record (supplied e.g. by DNS server "some.nameserver.tld"),
the asking DNS server had to know already an authoritative DNS server for
the domain in question. Why repeat it again?

Newbie
Stefan




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