You have a single Active Directory domain. All domain controllers run Windows Server 2008
and are configured as DNS servers.
The domain contains one Active Directory-integrated DNS zone.
You need to ensure that outdated DNS records are automatically removed from the DNS
zone.
What should you do?
A.
From the properties of the zone, modify the TTL of the SOA record.
B.
From the properties of the zone, enable scavenging.
C.
From the command prompt, run ipconfig /flushdns.
D.
From the properties of the zone, disable dynamic updates.
Explanation:
http://technet.microsoft.com/en-us/library/cc753217.aspx
Set Aging and Scavenging Properties for the DNS Server
The DNS Server service supports aging and scavenging features. These features are
provided as a mechanism for performing cleanup and removal of stale resource records,
which can accumulate in zone data over time. You can use this procedure to set the default
aging and scavenging properties for the zones on a server.
Further information:
http://technet.microsoft.com/en-us/library/cc771677.aspx
Understanding Aging and Scavenging