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when a domain controller goes down...

I have two domain controllers in my domain.  Both have DNS and DHCP and activie directory.  If the main controller goes down, what should I do?  Should I promote the second one?  

What are some things I need to keep in mind in the event that the main controller goes down?

The main controller is 2003 server and the second controller is 2008
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What are the FSMO roles?
Also,  can't the domain function without seizing the roles?
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When does the FSMO roles become critical?  If the FSMO holder goes down and the second DC is online, when does it become an issue?
Yes, it becomes critical when the dc holding that perticular role goes down.
I guess the question I have is why is it critical?
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To me it seems worthless to have a backup DC that can't automatically handle domain authentication requests once the main FSMO DC goes down...
yes but you can always transfer those roles in the event of disaster. There are manual efforts required for this but this is how microsoft designed it.
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