GPT is Group policy template and GPC is group policy container in Java Security
Group policies stored at:
If the NTConfig.pol file exist, it has the highest priority among the numerous policies.
It's group policy inheritance model, where the policies are applied to Local machines, Sites, Domains and Organizational Units.
Universal groups are allowed only in native-mode Windows Server 2003 environments. Native mode requires that all domain controllers be promoted to Windows Server 2003 Active Directory.
Domain local groups assign access permissions to global domain groups for local domain resources. Global groups provide access to resources in other trusted domains. Universal groups grant access to resources in all trusted domains.
The CLR computes actual permissions at runtime based on code group membership and the calling chain of the code.
Authentication modes in ASP.NET is None, Windows, Forms and Passport.
Authentication happens first. You verify user's identity based on credentials. Authorization is making sure the user only gets access to the resources he has credentials for.