IIS

Network Services

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.

This is one of the most question in IIS. And along with that interviewer can as what is the different between Web farm and Web Garden ?

When we hosted our web Application on multiple web server under a load balancer call the Web Farm. This is generally used for heavy load web application where there are many user request at a time. So When Web Application is hosted on Different IIS Server over a load balancer, Load balancer is responsible for distribute the load on different server.

IIS having three different Identity.

1. Local System

2. Local Services

3. NetworkServices

App Pool and App Domain both are for isolations on different approches.App Pool use process to isolate without .net but for App Domain isolation methods by .net.

In Simple terms

For Multiple websites in IIS need different Application Pool.

In Single domain purpose we use Application Domain.

Configure multiple work process on one application pool in a web server is called as Web Garden.Application Pool can configure for multiple websites hosted in IIS.

ISAPI filters are DLL files used to modify the enhance functionality allocated by IIS.By default ISAPI filters run in IIS server.

change request URL or headers

perform custom authentication

Handle encryption and compression

For IIS 6.0 – NetworkServices,LocalService,LocalSystem

For IIS 7.0 – NetworkServices,LocalService,LocalSystem and Application Pool Identity.

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

1. None

2. Scripts Only

3. Scripts and Executable

<Drive>:inetpubwwwroot

Use the following command “IISRESET”.

1. Anonymous ( Default Authentication in IIS runs under IUSER_servername )

2. Integrated Windows Authentication

3. Basic Authentication

4. Digest Authentication

5. Passport Authentication

Yes. We can.

While creating Application Application Pool From IIS, there should have two option available first one is for Default Setting and Another is for Existing Setting as template.

We can select the second one and from the drop down listed below we can select any on the Application Pool as Template,.

Open IIS Configuration Manager

First of all Right Click on Default web sites > New > Virtual Directory .

Browse the Physical Path. Set the properites. Click on OK

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

Application Pool stated that Multiple web applications or Group of web applications.

Application pool contain one or more Web URLs used by Worker processes.For one website or many website we can assign Application Pool, to avoid the effect of other website need to create seperate Application Pool.

Right click on Application Pool ->All Task ->Save Configuration to a File.

It will save the configuration file in xml format.

For creating web graden we need to go to Application Pool, then Right Click on Application Pool > Properties > Goto Performance Tab

In Web Garden Section, increase the number of worker process. By default it is 1.

By default Each Application Pool runs with a Single Worker Process (W3Wp.exe). We can assign multiple Worker Process With a Single Application Pool. An Application Poll with multiple Worker process called Web Gardens. Each Worker Process Should have there own Thread and Own Memory space.