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Your network contains an Active Directory forest named contoso.com.
The forest contains a single domain. The domain contains three domain controllers.
The domain controllers are configured as shown in the following table.

You discover that when you run Group Policy Results from Group Policy Management, the settings from site-linked Group Policy objects (GPOs) fail to appear in
the results.
You need to ensure that the settings from site-linked GPOs appear in the results.
What should you do first?

A. Run adprep on DC3 by using Windows Server 2012 R2 installation media.

B. Transfer the infrastructure master role to DC3.

C. Upgrade DC2 to Windows Server 2012 R2.

D. Runadprepon DC1 by using Windows Server 2003 installation media.

Explanation:
In this scenario a Windows 2012 server has been added to a Windows 2003 network.
Note:
* Before adding your new Windows 2012 Domain Controller, or attempting to performaninplace upgrade of an existing Windows 2008 or 2008 R2 DC, you must
make sure that the Schema is upgraded to support your new Windows 2012 DC, and that you prepare each domain where you plan to install Windows 2012 DCs.
To do this we can use the ADPREP.exetool found in the support\adprep folder on your installation media.
* Starting with Windows 2012 there is only one version of ADPREP available, and that is a 64-bit version.
* Adprep is the utility–included in the OS installation media–that performs several crucial functions to upgrade AD to support that OS. The utility has three major
options: /forestprep, /domainprep, and /rodcprep. The /forestprep option runs first, extending the AD schema with new object and attribute classes that the new AD
versionneeds. The /domainprep option creates new well-known objects in AD, App1ies security changes, and miscellaneous other bits. Finally, /rodcprep makes
forest-wide security changes to allow read-only domain controller (RODC) functionality. The Windows Server2012 R2 version of adprep.exe can run on any server
that runs a 64- bit version of Windows Server 2008 or later.
http://technet.microsoft.com/en-us/library/bb726995.aspx
http://www.ipuptime.net/Multicast.aspx
http://technet.microsoft.com/en-us/library/gg144561(v=exchg.141).aspx
http://en.wikipedia.org/wiki/Unique_local_address

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