单项选择题 Your network contains a single Active Directory forest. The forest contains two domains named contoso.com and sales.contoso.com. The domain controllers are configured as shown in the following  table.   Server name  Domain  DNS zones hosted  DC1  contoso.com  contoso.com  DC2  contoso.com  contoso.com   DC3  sales.contoso.com  sales.contoso.com  DC4   sales.contoso.com  sales.contoso.com   All  domain  controllers  run Windows  Server  2008  R2.  All  zones  are  configured  as  Active  Directory-integrated zones.   You need to ensure that contoso.com records are available on DC3. Which command should you run（）

单项选择题 Your network contains an Active Directory forest. The forest contains one domain and three sites.   Each site contains two domain controllers. All domain controllers are DNS servers.  You create a new Active Directory-integrated zone.   You need to ensure that the new zone is replicated to the domain controllers in only one of the sites.   What should you do first（）

单项选择题 Your network contains an Active Directory domain named contoso.com. The contoso.com DNS zoneis stored in Active Directory. All domain controllers run Windows Server 2008 R2.   You need to identify if all of the DNS records used for Active Directory replication are correctly registered.   What should you do（）