Your network contains multiple subnets.
On one of the subnets, you deploy a server named Server1 that runs Windows Server 2012 R2.
You install the DNS Server server role on Server1, and then you create a standard primary zone named contoso.com.
You need to ensure that client computers can resolve single-label names to IP addresses.
What should you do first?（）

Your network contains an Active Directory forest named contoso.com. The forest contains a single domain. The domain contains two domain controllers named DC1 and DC2 that run Windows Server 2012 R2.
The domain contains a user named User1 and a global security group named Group1.
User1 logs on to a client computer named Computer1.
You need to disable the computer account of Computer1.
Which cmdlet should you run?（）