Some General DNS Questions...

Hey All - I am reading though tmy 70-291 book and have some questions, please
explain both clearly and completely.

1. Dns Zones, on page 4-15 of the ver 2, 70-291 book, here is my question.

on the first line under DNS Zones it says this: A dns zone is a Contigous
Portion of a namespace for which a server is authortative.

I understand that to mean, this dns server is authortative for the domain
(zone file) myhouse.local ? becuase that domain exists on this server and
this server is set to be the Name server for that domain.

Is that right? Is there anymore to that? Please explain...


On page - 4-19 same book, under the heading of: Root hints, last section...

"Furthurmore, for a computer, that is hosting a root dns server, you should
not use root hints at all. in this scenario windows 2003 automatically
deletes cache.dns file used for root hints"

I dont understand that at all... I have never seen a windows 2003 server
delete a cache.dns file, which contained the root hints?

and what is the difference between iterations and recursion? how come you
always have to leave the windows dns service set to use recursion?

Thank you,

Sorry if this is too long, (WIndows 2003, SP2 R2).

Robert