Newbie to Active directory - Domain - Trees - Forests?

I am newbie have an NT Server with a single domain called NTDOMAIN and Exch5.5 working fine.   In order to upgrade to Exch2000 I need to setup Active Directory on the network.

I took another server and installed W2KAdvServer and created a new Domain? called W2KSERV using Active Directory.  (well I say Domain because it looks like a domain to NT)

Is this a domain - a tree or a forest - I am new to active directory
TgilbertAsked:
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JConchieCommented:
It is the root domain........and the only one at this point in your AD forest........and probably the only one you will need.

I would suggest that you do some serious reading before you get yourself into a world of trouble.  A google on active directory or active directory basics will yield a wealth of info, for instance:
http://www.informit.com/isapi/product_id~%7BB7B37D8C-F739-4C31-A7B1-41AD98744851%7D/content/index.asp
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JConchieCommented:
while studying, pay a large amount of attention to DNS....it is critical to AD.
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