Versioning Control Question:
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Explain impersonation?

Answer:

At times users access a resource as though they were
someone else. This is known as impersonation. For example,
if a web page has no access controls, then any user can
access that web page. HTML pages, ASP pages, and components
in version 3.0 and earlier can be accessed through two
accounts named IUSR_machinename and IWAM_machinename. Both
the accounts are set up during IIS installation, and are
automatically added to all the folders in every web site on
the server.

Anonymous access to a resource in IIS makes the task of
identifying a user extremely difficult. But there is no
need to authenticate a user in the case of IIS. When IIS
receives a request for a web page or other resource that
has permission for anonymous access, IIS treats the
IUSR_machinename account as the user's account, to access
the resources. If the resource requested by the user is an
ASP page that uses a COM or COM+ component, that component
is executed using the IWAM_machinename account.

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