Determine the location of the user community using the following checklist.
Ensure adequate access to an authenticating BDC.
If so, their accounts cannot be tied to a location. Consider using a single master-domain or multiple master-domain model.
Or, is all data central, so that no local processing can be done without the WAN?
The speed of the links needed between locations should be determined by the resource usage across the links and by the frequency of changes to settings for users and groups.