Answer Posted / mohini nalawade

Authentication
Authentication refers to the method used by the server to
verify the clients’ identity. This feature provides methods
to authenticate clients via a set of standardized and
reusable methods that require little or no modification.
The methods available to developers are:
None – This method does nothing.
Windows Authentication – Attempts to verify users by
validating supplied credentials using authentication
methods used by the Windows operating system. This includes
NTLM (NT LanMan) and Kerberos (for systems running versions
more current than Windows NT 4.0). Windows authentication
is used by default if no method is explicitly selected.
IIS Authentication – Uses authentication methods provided
by the IIS Web server.
Passport Authentication – Verifies users through the use of
the Microsoft Passport authentication server.
Forms Authentication – Allows for application developers to
provide a form for authenticating users in a standardized
way. User accounts can be made specific to the application
and stored in the web.config file.

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