Best way to implement active directory in multiple locations

Hi,
Currently we don't have an active directory domain and looking in to configuring a test setup for it.
We have 6 countries and in some countries we have 2 to 3 sites. There is a constant VPN connection between all the locations.
Our users are travelling between the sites. IT is managed from a central location and have one IT responsible on each site which also have to create / modify users.
Should we go for one domain with a domain controller in each site? Or should we go for a parent DC at central location with child DC (sub domains) at the other sites?
What are the pro's and cons of each scenario?
Kr,
Joeri

Hi jfeyen,
I think you have some misunderstanding about OU and site in AD.
OU is the purpose container that can be used to group most other object classes together for administrative purposes. An organizational unit in Active Directory is analogous to a directory in the file system; it is a container that can hold other objects.
And it represent the logical structure of your organization as domain.
Sites in Active Directory represent the physical structure, or topology, of your network. Active Directory uses topology information, stored as site and site link objects in the directory, to build the most efficient replication topology. A site is a set
of well-connected subnets. Sites differ from domains.
For your information, please refer to the following articles:
Organizational Units
http://technet.microsoft.com/en-us/library/cc978003.aspx
Sites overview
http://technet.microsoft.com/en-us/library/cc782048(v=ws.10).aspx
So if a user or a computer connected to the domain, he will be located in the OU which is configured. And this will not change except the configuration changes.
As for the question If we use site & services our workstations will automatically find the right DC?, please refer to the following article:
Finding a Domain Controller in the Closest Site
http://technet.microsoft.com/en-us/library/cc978016.aspx
Regards,
Lany Zhang

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>
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