Extranet topologies for SharePoint 2010 Products: Model
http://technet.microsoft.com/en-us/library/cc263513.aspx
Published: February 3, 2011
This model illustrates the specific extranet topologies that have been tested with SharePoint 2010 Products. Provides a comparison of ISA Server, Forefront TMG, Forefront UAG when used as a firewall or gateway product with SharePoint 2010 Products.
Extranet Topologies for SharePoint 2010 Products
Visio (http://go.microsoft.com/fwlink/p/?LinkId=187987)
PDF (http://go.microsoft.com/fwlink/p/?LinkId=187988)
XPS (http://go.microsoft.com/fwlink/p/?LinkId=187986)