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You need to reclaim the hard disk space used by theglobal catalog on DC5

Your network contains an Active Directory forest. The forest contains 10 domains. All domain controllers are
configured as global catalog servers.
You remove the global catalog role from a domain controller named DC5.
You need to reclaim the hard disk space used by theglobal catalog on DC5.
What should you do?

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A.
From Active Directory Sites and Services, run theKnowledge Consistency Checker (KCC).

B.
From Active Directory Sites and Services, modify the general properties of DC5.

C.
From Ntdsutil, use the Semantic database analysisoption.

D.
From Ntdsutil, use the Files option.

Explanation:
Reference 1:
http://http://technet.microsoft.com/en-us/library/cc816618.aspx
Database defragmentation
In cases in which the data decreases significantly, such as when the global catalog is removed from a domain
controller, free disk space is not automatically returned to the file system. Although this condition does not
affect database operation, it does result in large amounts of free disk space in the database. To decrease the
size of the database file by returning free disk space from the database file to the file system, you can perform
an offline defragmentation of the database.Whereas online defragmentation occurs automatically while AD DS
is running, offline defragmentation requires takingthe domain controller offline and using the Ntdsutil.exe
command-line tool to perform the procedure.
Reference 2:
http://technet.microsoft.com/en-us/library/cc794920.aspx
To perform offline defragmentation of the directorydatabase
1. Open a Command Prompt as an administrator: On theStart menu, right-click Command Prompt, and then
click Run as administrator. If the User Account Control dialog box appears, provide credentials, if required,
and then click Continue.
2. At the command prompt, type the following command, and then press ENTER: net stop ntds
3. Type Y to agree to stop additional services, and then press ENTER.
4. At the command prompt, type ntdsutil, and then press ENTER.
5. At the ntdsutil prompt, type activate instance ntds, and then press ENTER.
6. At the ntdsutil prompt, type files, and then press ENTER.
7. (…)


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