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IIS Interview Questions and Answers

What is the Role of IIS?

                               Visual studio has ASP.NET Engine which is capable to run Asp.net web application. So we just click on Run button to start the application.
IIS provides a redesigned WWW architecture which can help you achieve better performance, scalability, reliability and security for our Web sites. IIS supports following Protocol HTTP/HTTPS, FTP, FTPS, SMTP Etc. We need to host the site on IIS, when request comes from client it first hits the IIS Server, then the server passed it to ASP.NET worker process to execute. Then the response also passes to client via IIS itself.  Note only Hosting of Site we can create our FTP Server, SMTP Server using IIS itself. There are different version of IIS available like 5.1, 6.0, 7.0 etc

What is the different version on IIS that you have worked on?

                             Before answering this question you need to know what are the different IIS version is available in different OS. Below is the list of IIS version with different Operating system.

Windows Server 2008 – Windows Vista – Home Premium/ Ultimate – IIS 7.0
Windows Server 2003 – IIS 6.0
Windows XP Professional – IIS 5.1

                           Now based on your working experience you can say that you have worked on IIS 5.1 and 6.0 or only IIS 7. Etc.  Now, the next question that can asked after answering this question is “what is the difference between them ? ” – Well I will come with this later.

What is the Role of Http.Sys in IIS?

HTTP.SYS is the kernel level components of IIS. All client requests comes from client hit the HTTP.Sys of Kernel level. HTTP.SYS then makes a queue for each and every request for each and individual application pool based on the request. Whenever we create any application pool IIS automatically registers the pool with HTTP.SYS to identify the particular during request processing.

 Before Giving the Definition: you can say like this, Concept of Application pool has from IIS 6.0.

                          Application pools are used to separate sets of IIS worker processes that share the same configuration and application boundaries. Application pools used to isolate our web application for better security, reliability, and availability and performance and keep running without impacting each other . The worker process serves as the process boundary that separates each application pool so that when one worker process or application is having an issue or recycles, other applications or worker processes are not affected. One Application Pool can have multiple worker process Also.

Main Point to Remember:

1. Isolation of Different Web Application
2. Individual worker process for different web application
3. More reliably web application
4. Better Performance

What is the Name of Default Application Pool in IIS?

                        Though we can create new application pool IIS with different settings, but IIS having its own default application pool named : DefaultAppPool.

What are the different types of Identity available in IIS 6.0?

                        IIS having three different Identities.
1. Local System
2. Local Services
3. Network Services

Name of default Identity of IIS6.0?

                        Default Identity of IIS 6.0 is Network Services. Which is having very minimum rights on your system? The user can only have the read access of the site.

What is Recycling of Application Pool?

                         Recycling Application pool means recycle the Worker process (w3wp.exe) and the memory used for the web application.  There are two types of recycling related with Application pool

1. Recycling Worker Process – Predefined Settings
2. Recycling Worker Process – Based on Memory

What are the main layers of IIS Architecture?

                          IIS having mainly two layers Kernel Mode and User Mode

                                 Below are the subsection of both of them.
1. Kernel Mode
o HTTP.SYS

                                            2. User Mode
o Web Admin Service
o Virtual Directory
o Application Pool

What is the Role of Http.Sys in IIS?

                                 HTTP.SYS is the kernel level components of IIS. All client requests comes from client hit the HTTP.Sys of Kernel level. HTTP.SYS then makes a queue for each and every request for each and individual application pool based on the request.  Whenever we create any application pool IIS automatically registers the pool with HTTP.SYS to identify the particular during request processing.

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