Sunday, December 11, 2011

IIS Administration Interview Questions and Answers Series 2

What is Application Pool in IIS ?
Application pool has introduced 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 with out 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.

Major Points:
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?
The default application pool name is : DefaultAppPool 

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

IIS having three different Identity.
1. Local System
2. Local Services
3. NetworkServices

Name of default Identity of IIS6.0?
Default Identity of IIS 6.0 is NetworkServices .
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 layer Kernel Mode and User Mode

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

2. User Mode
     Web Admin Service
     Virtual Directory
     Application Pool

What is the Role of Http.Sys in IIS ?
HTTP.SYS is the kernel level components of IIS. All client request 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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