which authentication mode is provided by IIS and which is provided by ASP.NET?

In inetmgr we can see:-
-Anonymous authentication
-ASP.NET Impersonation
-Basic authentication
-Digest authentication
-Forms authentication
-Windows authentication

1)Question is which of above are provided by IIS and which are provided by ASP.NET?
2)Moreover, firstly request reaches to IIS, that time which technique is used?
3)Later when request is passed to ASP.NET which technique is used?
4)What happens IIS sends authenticated user to ASP.NET?
5)What happens when IIS send unauthenticated used to ASP.NET? (is this possible?
6)Does concept change when Windows mode is used or forms mode is used?
...