Your network consists of one Active Directory forest that contains one root domain and 22 child
domains. All domain controllers run Windows Server 2003. All domain controllers run the DNS
Server service and host Active Directory-integrated zones. Administrators report that it takes more
than one hour to restart the DNS servers. You need to reduce the time it takes to restart the DNS
servers. What should you do?

A.
Upgrade all domain controllers to Windows Server 2008.

B.
Upgrade all domain controllers in the root domain to Windows Server 2008, and then set the
functional level for the root domain to Windows Server 2008.

C.
Deploy new secondary zones on additional servers in each child domain.

D.
Change the Active Directory-integrated DNS zones to standard primary zones.

Explanation:
Sometime DNS server can take an hour or more in companies that have extremely large zones and
the DNS data of the company is stored in AD DS. The result is that the DNS server is effectively
unavailable to service client requests for the entire time that it takes to load AD DS-based zones. The
problem can be solved by upgrading the domain controllers to Windows Server 2008. This is because
a DNS server running Windows Server 2008 now loads zone data from AD DS in the background
while it restarts so that it can respond to requests for data from other zones.
DNS Server Role/ Background zone loading
http://technet2.microsoft.com/windowsserver2008/en/library/533a1cfc-5173-4248-914c-
433bd018f66d1033.mspx?mfr=true