If you a planning a deployment of SharePoint 2010 with multilple geographic location, you have to look at this visio that is available from Microsoft:

Overview

This model illustrates supported architectures for deploying Microsoft SharePoint 2010 Products geographically.

http://www.microsoft.com/downloads/en/details.aspx?FamilyID=2204a8a6-1ea1-471e-b2a9-db95aebd4f64

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