Active Directory User Account Changes & Replication


Can someone explain what would/could happen in the following scenario?

Multiple domain controllers;  1 PDC at a colo and 2+ DCs at separate sites.  

If a use's account is modified in Active directory on Domain Controller A at one site and then the same change is made on Domain Controller B at another site before DC-A has a chance to replicate, will this cause a problem?  An example of possible changes would be password reset, profile path change or security group member change.

Are the implications different if the change is made on the PDC then on local DC or vise versa?

I'm trying to figure out what possible issues are created if say a client calls and asks to have a change made, then the call is dropped and the client decides to call in again and gets a different tech and both techs make a change but on different DCs with in a few minutes of each other.

Hopefully this is enough information, but if not please let me know and I can add some more details.

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Lee W, MVPTechnology and Business Process AdvisorCommented:
The changes are time stamped.  The latest one wins.  Nothing adverse should happen.

Active Directory doesn't have a PDC so it's not a question.  The FSMO roles allow ALL DCs to function equally - they mete out and manage certain aspects of AD, but are otherwise equal.  In NT4 domains 115+ years ago, the PDC was the only writable DC (BDCs were read only copies) - in AD, ALL DCs are writable.

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Agreed with Lee.

Curt PetriccaIT TechnicianCommented:
Lee is amazing as usual... Lee is completely correct the last DC to modify the data is the one that applies.
dzacharczyk2Author Commented:
Thank you all.
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