DRAG DROP
You manage an Active Directory forest named contoso.com.
The forest contains an empty root domain named contoso.com and a child domain named
child.contoso.com.
All domain controllers run Windows Server 2008. The functional level of the forest is
Windows Server 2008.
You need to raise the functional level of the forest to Windows Server 2008 R2. You must
achieve this goal by using the minimum amount of administrative effort.
What should you do?
To answer, move the appropriate actions from the list of actions to the answer area and
arrange them in the correct order.
Answer: 
Explanation:
To upgrade the forest level to Windows Server 2008 R2 we need to upgrade the servers
first. And before we upgrade the servers we need to prepare the domain and forest using
adprep.
Reference 1)
http://technet.microsoft.com/en-us/library/cc771949.aspx
Caution Do not raise the forest functional level to Windows Server 2008 R2 if you have or
will have any domain controllers running Windows Server 2008 or earlier.Reference 2)
MCTS 70-640 Cert Guide: Windows Server 2008 Active Directory, Configuring (Pearson IT
Certification, 2010) page 96
The Adprep Utility
Microsoft provides the Adprep utility to prepare a down-level Active Directory domain for
receiving Windows Server 2008 and Windows Server 2008 R2 domain controllers. Found in
the \sources\adprep folder of the installation DVD-ROM, this tool prepares the forest and
domain by extending the Active Directory schema and updating several required
permissions.
Running the Adprep /forestprep Command
You must run the Adprep /forestprep command on the schema master of the forest first. It
extends the schema to receive the new Windows Server 2008 enhancements, including the
addition of directory descriptors for certain objects including granular password policies. You
have to run this command and let its changes replicate throughout the forest before you run
the Adprep /domainprep command.
Reference 3)
Not really relevant, but some info on why using an empty root domain is no longer
preferable:
http://blogs.technet.com/b/askds/archive/2010/05/07/friday-mail-sack-tweener-clipartcomics-edition.aspx#adempty