Web.Config authentication Setting VS IIS Authentication mode

Can anyone tell me which settings take precedence,is it web.config or IIS.I know it is Web.config but i have an app which has <authenitcation mode = windows> set in web.config ,anonymous in IIS and uses forms based authentication.I am totally confused.Can anyone provide me with a msdn article claiming this.
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Hi ther,

Is not that it takes precedence, it's not always tied. For example, to use ASP.NET forms authentication, you'd normally use Anonymous authentication in IIS.

Here are a couple of links:

ASP.NET Authentication:

IIS Authentication:


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