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Explain the ways of authentication techniques in ASP.NET

Selection of an authentication provider is done through the entries in the web.config file for an application.

The modes of authentication are:

<authentication mode=''windows''>
<authentication mode=''passport''>
<authentication mode=''forms''>

Custom authentication needs installation of ISAPI filter in IIS. It compares incoming requests to a list of source IP addresses and a request is considered to be authenticated if it comes from an acceptable address.