The primary ADFS authentication methods are:
For resources to be accessed from outside the corporate network, Forms Authentication is selected by default. In addition, you can also enable Certificate Authentication – in other words, smartcardbased authentication or userclientcertificate authentication that works with ActiveDirectory DomainServices (AD DS).
For intranet resources, WindowsAuthentication is selected by default. In addition, you can also enable Forms and/or Certificate Authentication.