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（）