Which are the different ASP.NET authentication modes

ASP.NET supports the following Authentication Providers

• Windows : Is used in conjunction with IIS authentication. Authentication is performed by IIS in one of three ways: basic, digest, or Integrated Windows Authentication. When IIS authentication is complete, ASP.NET uses the authenticated identity to authorize access
• Forms : The user provides credentials and submits the form.
• Passport : Centralized authentication service provided by Microsoft that offers a single logon and core profile services for member sites.
• None : No Authentication provided. This is default Authentication mode

In the web.config file, you can specify this setting:

<authentication 
   mode= ' [ Windows | Forms | Passport | None ] '>
</authentication>