Your network consists of a single Active Directory domain.
All domain controllersrun Windows Server 2008 R2.
You need to identify the Lightweight Directory Access Protocol (LDAP) clients that are using the largest
amount of available CPU resources on a domain controller.
What should you do?

A.
Review performance data in Resource Monitor.

B.
Review the Hardware Events log in the Event Viewer.

C.
Run the Active Directory Diagnostics Data Collector Set. Review the Active Directory Diagnostics report.

D.
Run the LAN Diagnostics Data Collector Set. Review the LAN Diagnostics report.

Explanation:
http://servergeeks.wordpress.com/2012/12/31/active-directory-diagnostics/
Active Directory Diagnostics
Prior to Windows Server 2008, troubleshooting Active Directory performance issues often required the
installation of SPA. SPA is helpful because the Active Directory data set collects performance data and it
generates XML based diagnostic reports that make analyzing AD performance issues easier by identifyingthe
IP addresses of the highest volume callers and the type of network traffic that is placing the most loads on the
CPU.
Download SPA tool: http://www.microsoft.com/en-us/download/details.aspx?id=15506
Now the same functionality has been built into Windows Server 2008 and Windows Server 2008 R2 and you
don’t have to install SPA anymore.
This performance feature is located in the Server Managersnap-in under the Diagnosticsnode and when the
Active Directory Domain Services Roleis installed the Active Directory Diagnostics datacollector set is
automatically created under System as shown here.

When you will check the properties of the collectoryou will notice that the data is stored under %systemdrive%
\perflogs, only now it is under the \ADDS folder and when a data collection is run it creates a new subfolder
called YYYYMMDD-#### where YYYY = Year, MM = Month and DD=Day and #### starts with 0001 . Active
Directory Diagnostics data collector setruns for a default of 5 minutes. This duration period cannot be
modified for the built-in collector. However, the collection can be stopped manually by clicking the Stop button
or from the command line.

To start the data collector set, you just have to right click on Active Directory Diagnostics data collector set
and select Start. Data will be stored at %systemdrive%\perflogslocation.

Once you’ve gathered your data, you will have theseinteresting and useful reports under Report section, to aid
in your troubleshooting and server performance trending.

Further information:
http://technet.microsoft.com/en-us/library/dd736504%28v=ws.10%29.aspx
Monitoring Your Branch Office Environment
http://blogs.technet.com/b/askds/archive/2010/06/08/son-of-spa-ad-data-collector-sets-in-win2008-and-beyond.
aspx
Son of SPA: AD Data Collector Sets in Win2008 and beyond