Your network contains an Active Directory forest named fabrikam.com. The forest contains the following
domains:
– Fabrikam.com
– Eu.fabrikam.com
– Na.fabrikam.com
– Eu.contoso.com
– Na.contoso.com
You need to configure the forest to ensure that theadministrators of any of the domains can specify auser
principal name (UPN) suffix of contoso.com when they create user accounts from Active Directory Users and
Computers.
Which tool should you use?

A.
Active Directory Sites and Services

B.
Set-ADDomain

C.
Set-ADForest

D.
Active Directory Administrative Center

Explanation:
Quite similar to K/Q41.
We would use the following command to achieve this:
Set-ADForest -UPNSuffixes @{Add=”contoso.com”}
Reference 1:
http://technet.microsoft.com/en-us/library/dd391925.aspx
Creating a UPN Suffix for a Forest
This topic explains how to use the Active Directorymodule for Windows PowerShell to create a new user
principal name (UPN) suffix for the users in a forest. Creating an additional UPN suffix helps simplify the names
that are used to log on to another domain in the forest.
Example
The following example demonstrates how to create a new UPN suffix for the users in the Fabrikam.com forest:
Set-ADForest -UPNSuffixes @{Add=”headquarters.fabrikam.com”}
Reference 2
http://technet.microsoft.com/en-us/library/ee617221.aspx
Set-ADForest
Modifies an Active Directory forest.
Parameter
UPNSuffixes
Modifies the list of user principal name (UPN) suffixes of the forest. This parameter sets the multi-valued
msDS-UPNSuffixes property of the cross-reference container. This parameter uses the following syntax to add
remove, replace, or clear UPN suffix values.
Syntax:
To add values:
-UPNSuffixes @{Add=value1,value2,…}