IIS level Questinos , Application server

Q1) What is scavenging ?
Ans)
When server running your ASP.NET application runs low on memory resources, items
are removed from cache depending on cache item priority. Cache item priority is set when you add item to cache. By setting the cache item priority controls the items scavenging are removed first.
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Q2)How can we take back-ups in IIS Server?
Ans)

Step 1 : In the IIS (inetmgr), right click on the "Computer" icon under "Internet Information Services" . Click "All Tasks" and select "Backup/Restore Configuration".

Step 2 : Click on button "Create backup". Give Name for your backup file. If you want encryption enable encryption option and give UserName and Password and then click OK.
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Q3)What is the default user name of an anonymous login in IIS?
Ans)In IIS, an anonymous user will be given with a user name of "IUSR_MachineName "
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4)How can we check whether IIS is being installed in my system or not?
Ans)
To verify if IIS is installed or not we need to go to ’Add or Remove Programs’ utility in the Control panel and click on the ’Add/Remove Windows Components’ in the side menu.
There we must locate an item called "Internet Information Services (IIS)". If this is checked, IIS should be installed.
So that you can have your IIS installed in your system if it is not installed