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DC promotion over slower WAN link

Last Modified: 2012-05-12
We are in the process of standing up several remote DC's that will reside in branch offices that are connected over a WAN link.  Our AD infrastructure is on the larger side, with perhaps 10 to 20,000 objects to replicate.  Our desire is for each remote DC to be both a DNS and GC.  Are there any gotchas to performing such a promotion?  Anything we should keep an eye on?  Specifically I'm curious about:
1. length of time initial replication push might take.
2. whether or not the DC will try to self-register in it's own copy of DNS before replication has completed, thereby causing some failures.
3. Any other issues with this type of promotion that we may not have considered or know about.

Background Info:
The servers are Server 2008 R2, and the domain is mixed with some 2003 DC's still in the domain, but back at the main data center.  The domain infrastructure has an empty root domain, and a child domain where all accounts (user/computer) reside.  The new DC's will be child members, not root members.
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