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What are the differences between extending a web app and adding a host header then adding alternate access mappings in SharePoint 2010? My understanding is that , if you are using different authentication scheme for different zones , then extending a web app. If you would like to access the same web apps but with different URL for different zones ,using adding a host header then adding alternate access mappings. Please feel free to correct me if I got it complete wrong.

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Extending the application allows you to view over a number of different hosts (using AAM) but more importantly allows you to specify a different authentication provider and security settings.

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Good answer. e.g. if you wanted to extend a Web application for external usage you might choose to use FBA as opposed to Windows authentication. – Benjamin J Athawes Jan 20 '11 at 13:04

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