IIS Interview Questions..

What is Application Pool?
you can separate different Web applications and Web sites into groups known as application pools.
What is Virtual Directory?
A virtual Directory is a directory that is not contained in the home directory but appears to client browsers as though it were
what is the difference between IIS6 and IIS7

New Admin tools

Integrated form-based authentication

Integrated ASP.NET and IIS authentication

shared configuration
automatic application pool isolation
Improved FTP service
good performance and more security 
What is ISAPI?
Internet Server Application Programming Interface, is an API developed to provide the applications developers with a powerful way to extend the functionality of IIS.
What is metabase?

IIS metabase is a special databse which maintains the settings and configuration data for IIS.

IIS logfile format w3svc

%system root%/system32/logfiles

What debugging tools do you use for IIS?
Debugdiag.msi
How to host multiple websites on IIS server?
Web sites hosted on the same server can be distinguished using any one of the following unique identifiers.
Host header name
IP address
TCP port number
Using host header names to uniquely identify sites on a server is recommended for most situations.