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Your network contains an Active Directory forest named contoso.com. The forest contains two domains named contoso.com and child.contoso.com and two sites named Site1 and Site2. The domains and the sites are configured as shown in following table. When the link between Site1 and Site2 fails, users fail to log on to Site2. You need to identify what prevents the users in Site2 from logging on to the child.contoso.com domain. What should you identify?
Correct Answer: B
Explanation/Reference: Explanation: User logon. In a forest that has more than one domain, two conditions require the global catalog during user authentication: In a domain that operates at the Windows 2000 native domain functional level or higher, domain controllers must request universal group membership enumeration from a global catalog server. When a user principal name (UPN) is used at logon and the forest has more than one domain, a global catalog server is required to resolve the name. References: http://technet.microsoft.com/en-us/library/cc728188(v=ws.10).aspx