You deploy an Active Directory domain named contoso.com to the network. The domain is configured as an
Active Directory-integrated zone. All domain controllers run Windows Server 2012 and are DNS servers.
You plan to deploy a child domain named operations.contoso.com.
You need to recommend changes to the DNS infrastructure to ensure that users in the operations department
can access the servers in the contoso.com domain.
What should you include in the recommendation?

A.
A zone delegation for _msdcs.contoso.com

B.
Changes to the replication scope of contoso.com

C.
Changes to the replication scope of _msdcs.contoso.com

D.
Changes to the replication scope of operations.contoso.com

Explanation:
http://support.microsoft.com/kb/255248
Manually Create a Delegation for the Child Domain on the Parent (Root) DNS Server
1. Right-click the root zone, click New Delegation,and then click Next.
2. Type the domain name for the child domain, and then click Next.
3. Add the child DNS server to host the new zone, and then click Next.NOTE: A domain controller that is a DNS
server should have a static Transport Control Protocol/Internet Protocol (TCP/IP) address. Verify thatthis step
is performed before you install DNS on the child domain controller. If no DNS TCP/IP address exists, DNS is
installed as a root server. If you see that a “.” folder is created after you install DNS, you must remove the root
configuration. For additional information about howto do this, click the article number below to viewthe article
in the Microsoft Knowledge Base:
229840 DNS Server’s Root Hints and Forwarder Pages Are Unavailable
4. On the child domain DNS server, right-click My Network Places, and then click Properties.
5. Right-click the appropriate local connection, and then click Properties.
6. Under Components checked are used by this connection, click Internet Protocol (TCP/IP), and then click
Properties.
7. Click Use the following DNS server addresses:, and then type the TCP/IP address of the parent (root) DNS
server.