Your network contains an Active Directory domain named contoso.com.
The domain contains a domain controller named DC1.
DC1 has the DNS Server server role installed.
The network has two sites named Site1 and Site2.
Site1 uses 10.10.0.0/16 IP addresses and Site2 uses10.11.0.0/16 IP addresses.
All computers use DC1 as their DNS server.
The domain contains four servers named SERVER1, SERVER2, SERVER3, and SERVER4.
All of the servers run a service named Service1.
DNS host records are configured as shown in the exhibit. (Click the Exhibitbutton.)
You discover that computers from the 10.10.1.0/24 network always resolve Service1 to the IP address of
SERVER1.
You need to configure DNS on DC1 to distribute computers in Site1 between SERVER1 and SERVER2 when
the computers attempt to resolve Service1.
What should run on DC1?
Exhibit:

A.
dnscmd /config /bindsecondaries 1

B.
dnscmd /config /localnetpriority 0

C.
dnscmd /config /localnetprioritynetmask 0x0000ffff

D.
dnscmd /config /roundrobin 0

Explanation:
http://support.microsoft.com/kb/842197
dnscmd [DNS_SERVER_NAME] /Config /LocalNetPriorityNetMask 0x0000ffff
This command changes the default Class C mask to match our sites /16 (255.255.0.0) mapping.
0x0000ffff, being hexidecimal notation for the reciprocal 0.0.255.255?wildcard mask.