Your network contains an Active Directory domain. The domain contains 10 domain
controllers that run Windows Server 2008 R2.
You need to monitor the following information on the domain controllers during the next five
days:
Memory usage
Processor usage
The number of LDAP queries
What should you do?

A.
Create a User Defined Data Collector Set (DCS) that uses the Active Directory
Diagnostics template.

B.
Use the System Performance Data Collector Set (DCS).

C.
Create a User Defined Data Collector Set (DCS) that uses the System Performance
template.

D.
Use the Active Directory Diagnostics Data Collector Set (DCS).

Explanation:
The System Performance Data Collector Set/System Performance template does not
monitor Active Directory data (we need the number of LDAP queries). That leaves out
answers
B (“Use the System Performance Data Collector Set (DCS)”) and
C (“Create a User Defined Data Collector Set (DCS) that uses the System Performance
template”).
Because the Active Directory Diagnostics Data Collector Set (DCS) runs only for 5 minutes
and we need to monitor for 5 days we have to use a User Defined Data Collector Set (DCS)
that uses the Active Directory Diagnostics template. For a User Defined Data Collector Set
we can set the monitoring duration in seconds, minutes, hours, days or weeks.
So we have to create a User Defined Data Collector Set (DCS) that uses the Active
Directory Diagnostics template.

http://blogs.technet.com/b/askds/archive/2010/06/08/son-of-spa-ad-data-collector-sets-inwin2008-andbeyond.aspx
AD Data Collector Sets in Win2008 and beyond
The Active Directory Diagnostics data collector set runs 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. If reducing or
increasing the time that a data collector set runs is required, and manually stopping the
collection is not desirable, then see How to Create a User Defined Data Collection Set.