least number of win2k3 servers for redundant servers?

what is the least number of  servers would i need to create windows 2003 redundant servers? do i need a separate server for my active directory? please help.
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If you need redundancy and the network doesn't hold more than prox 500 users, you can go about with two DC's.. First off all, install one DC and craete the domain. Then, add the second server to this domain (by using dcpromo). Make sure to install DNS and DHCP on both servers for redundnacy and make sure that both servers are Global Catalog server (go to AD Sites & Services, Defauilt First site, Server, NTDS settings, properties and enable the "Global Catalog" option..

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gayagaya2Author Commented:
thanks rhandels!
Ur welcome...
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