Your network contains an Active Directory domain named contoso.com. The contoso.com domain contains a
domain controller named DC1.
You create an Active Directory-integrated GlobalNames zone. You add an alias (CNAME) resource record
named Server1 to the zone. The target host of the record is server2.contoso.com.
When you ping Server1, you discover that the name fails to resolve. You are able to successfully ping server2.
contoso.com.
You need to ensure that you can resolve names by using the GlobalNames zone.
Which command should you run?

A.
Dnscmd DCl.contoso.com /ZoneAdd GlobalNames /DsPrimary /DP /domain

B.
Dnscmd DCl.contoso.com /config /Enableglobalnamessupport forest

C.
Dnscmd DCl.contoso.com /config /Enableglobalnamessupport 1

D.
Dnscmd DCl.contoso.com /ZoneAdd GlobalNames /DsPrimary /DP /forest

Explanation:
Support for Globalnames must be enabled, otherwise the DNS Server service does not resolve single-label
names in the GlobalNames zone.
Reference:
http://technet.microsoft.com/en-us/library/cc772069.aspx
dnscmd /config
Changes values in the registry for the DNS server and individual zones. Accepts server-level settings and zone-level settings.
Parameter
/enableglobalnamessupport {0|1}
Enables or disables support for the GlobalNames zone. The GlobalNames zone supports resolution of single-label DNS names across a forest.
0
Disables support for the GlobalNames zone. When youset the value of this command to 0, the DNS Server
service does not resolve single-label names in the GlobalNames zone.
1
Enables support for the GlobalNames zone. When you set the value of this command to 1, the DNS Server
service resolves single-label names in the GlobalNames zone.