There are 4 types of authentications.

1.WINDOWS AUTHENTICATION

2.FORMS AUTHENTICATION

3.PASSPORT AUTHENTICATION

4.NONE/CUSTOM AUTHENTICATION

The authentication option for the ASP.NET application is specified by using the tag in the Web.config file, as shown below:

other authentication options

1. WINDOWS AUTHENTICATION Schemes

I. Integrated Windows authentication

II. Basic and basic with SSL authentication

III. Digest authentication

IV. Client Certificate authentication

2. FORMS AUTHENTICATION

You, as a Web application developer, are supposed to develop the Web page and authenticate the user by checking the provided user ID and password against some user database

3.PASSPORT AUTHENTICATION

A centralized service provided by Microsoft, offers a single logon point for clients. Unauthenticated users are redirected to the Passport site

4 NONE/CUSTOM AUTHENTICATION:

If we don’t want ASP.NET to perform any authentication, we can set the authentication mode to “none”. The reason behind this decision could be: We don’t want to authenticate our users, and our Web site is open for all to use. We want to provide our own custom authentication