Your network contains an Active Directory forest named contoso.com. The forest contains two domains named
contoso.com and child.contoso.com. The forest contains two sites named Seattle and Denver. Both sites
contain users, client computers, and domain controllers from both domains.
The Seattle site contains the first domain controller deployed to the forest. The Seattle site also contains the
primary domain controller (PDC) emulator for both domains. All of the domain controllers are configured as
DNS servers. All DNS zones are replicated to all ofthe domain controllers in the forest.
The users in the Denver site report that is takes along time to log on to their client computer when they use
their user principal name (UPN). The users in the Seattle site do not experience the same issue.
You need to reduce the amount of time it takes for the Denver users to log on to their client computerby using
their UPN.
What should you do?

A.
Reduce the cost of the site link between the Denver site and the Seattle site.

B.
Enable the global catalog on a domain controller in the Denver site.

C.
Enable universal group membership caching in the Denver site.

D.
Move a PDC emulator to the Denver site.

E.
Reduce the replication interval of the site link between the Denver site and the Seattle site.

F.
Add an additional domain controller to the Denversite.

Explanation:
Quite similar to K/Q39.
Reference:
http://technet.microsoft.com/en-us/library/cc728188.aspx
Common Global Catalog Scenarios
The following events require a global catalog server:
(…)
User logon. In a forest that has more than one domain, two conditions require the global catalog during
user authentication:
1. When a user principal name (UPN) is used at logonand the forest has more than one domain, a global
catalog server is required to resolve the name.
2. (…)