Your company has a main office and a branch office.  
The network contains an Active Directory domain named contoso.com. The DNS zone for contoso.com is  configured as an Active Directory-integrated zone and is replicated to all domain controllers in the  domain.  
The main office contains a writable domain controller named DC1. The branch office contains a read-only  domain controller （RODC） named RODC1. All domain controllers run Windows Server 2008 R2 and are  configured as DNS servers.  
You uninstall the DNS server role from RODC1.  
You need to prevent DNS records from replicating to RODC1. 
What should you do（）

Your network contains an Active Directory domain named contoso.com.  
You create a 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 successfully resolve server2.contoso.com.  
You need to ensure that you can resolve names by using the GlobalNames zone. 
What should you do（）