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What happens to sub domains when root domain lost?

Suppose I have a root domain of root.com and a sub domain of sub.root.com.  What would happen to the sub.root.com domain if the DCs for root.com were removed/switched off?  Would the sub domain carry on working, or would they screw up because the root domain they hang off doesn't exist any more?  This is more a hypothetical question than a real situation I have.

Many thanks
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timungless
Asked:
timungless
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1 Solution
 
rindiCommented:
the sub.root.com should still work, if you are directly connected to that domain. you wouldn't able to find anything on root.com though. It also depends somewhat if you have a DNS server running on sub.root.com and how that dns server is configured.
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WeHeCommented:
the sub domain will definitly die, not yet but soon.
in the root domain, there are all forest FSMO roles held. if they are missing, no shema changes will be possible.
also no domain naming master is present.
Replication will also have dfificulties to handle a non existant root domain.
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WeHeCommented:
I can't belive, this is the correct answer.
But you will see.
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