2008r2 Domain controllers


We are trying to get rid of domain controllers in branch offices. Is there a best practice, at what point should we have a domain controller in the branch. The forest is 2008r2.

Suppose we have a branch office with 500 users and they are connected to nearest data center via 30mb pipe (redundant circuits), would you suggest a domain controller in the branch site.

Thanks for your advise and assistance.
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Absolutely need a DC for 500 users.  Use a Core installation if security is an issue, or upgrade to 2012 and use Branch office.
DC needed for login, DHCP and DNS if nothing else.  As well as Group Policy updates.
Parity123Author Commented:
What if a branch has 250 users, would you still advocate for a DC.

DHCP is not provided by DC.
Yes, even for 100 users.  My two cents
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Jeremy WeisingerSenior Network Consultant / EngineerCommented:
I completely agree with pjam.

What is your concern or goal? Why do you want to get rid of the DCs?

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Parity123Author Commented:
We are in the process of consolidating domain controllers. We only want to place them where there is not sufficient bandwidth. Some sites have 50mb bandwidth to the datacenter. We want to remove DC's where we can. Some sites have 70 users with an MPLS circuit.
Jeremy WeisingerSenior Network Consultant / EngineerCommented:
Active Directory is the lifeblood of the network. You need to make sure that is the most reliable service as pretty much everything else depends on it. Even for 100mb, I would still keep at least one DC at a site. If there's a few hundred users, put 2 DCs there. IMO.
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