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 the global catalog on DC5.
What should you do?
A.
From Active Directory Sites and Services, run the Knowledge Consistency Checker
(KCC).
B.
From Active Directory Sites and Services, modify the general properties of DC5.
C.
From Ntdsutil, use the Semantic database analysis option.
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 taking the 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 directory database
1. Open a Command Prompt as an administrator: On the Start 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.