Your company has an Active Directory domain. The main office has a DNS server named DNS1  that is configured with Active Directory-integrated DNS. The branch office has a DNS server  named DNS2 that contains a secondary copy of the zone from DNS1. The two offices are  connected with an unreliable WAN link.    
You add a new server to the main office. Five minutes after adding the server， a user from the  branch office reports that he is unable to connect to the new server. You need to ensure that the  user is able to connect to the new server.    
What should you do（）

our network consists of a single Active Directory domain. You have a domain controller and a  member server that run Windows Server 2008 R2. Both servers are configured as DNS servers.  Client computers run either Windows XP Service Pack 3 or Windows 7. You have a standard  primary zone on the domain controller. The member server hosts a secondary copy of the zone.    
You need to ensure that only authenticated users are allowed to update host （A） records in the  DNS zone.    
What should you do first（）