new domain or additional DC

With Novell's move to Linux, our site will probably move to MS Active directory.  We are a small school district with two buildings connected by 100m of fiber.  We are considering two directory structures. 1. Single domain, two DCs one at the elementary and one in the secondary.  2.  Two domains, one in elementary and one at secondary.  What are the advantages/disadvantages of these two? As I understand it, plan 1 provides redundency if one server goes down, but creates more WAN traffic for replication. Plan 2 has less WAN traffic, but if one server goes down, that domain is down. Looking for recommendations.
thanks
hage1Asked:
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Jay_Jay70Commented:
i would go with design 1

i think its more important to look at redundancy here and also adminsitration, one AD which means one nice single point of administration

your setup doesnt call for two domains at all, WAN traffice isnt an issue, as you can control your replication times, and AD traffic isnt exactly huge!

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Jay_Jay70Commented:
if you need different security sets for different sides of the school, you can use a detailed AD structure to apply different policies and priviliges inter-site
jwildingCommented:
As for replication.  Windows Server 2003 (unlike Windows 2000 server) only replicates changed items, not everything, so after initial set-up, replication traffic will likely be nominal and way below what I guess your fiber can handle.  Like Jay Jay70 says, you get better redundancy.

J
hage1Author Commented:
I agree completely.  I just wanted some reenforcement from somebody out there.  I feel like a traitor moving from Novell to MS, but we've got test servers setup for both and MS seems much more robust.  Thanks
Jay_Jay70Commented:
ah its not being a traitor, its simply coming to the light my friend!
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