Your network contains an Active Directory domain named contoso.com. The network contains 500
client computers that run Windows 8. All of the client computers connect to the Internet by using a
web proxy.
You deploy a server named Server1 that runs Windows Server 2012 R2. Server1 has the DNS Server
server role installed.
You configure all of the client computers to use Server1 as their primary DNS server.
You need to prevent Server1 from attempting to resolve Internet host names for the client
computers.
What should you do on Server1?
A.
Create a primary zone named “root”.
B.
Create a primary zone named “GlobalNames”.
C.
Create a forwarder that points to 169.254.0.1.
D.
Create a primary zone named “.”.
Correct answer is D
There is no documentation about zone named “root”
Instead, DNS root zone is a zone with name “.” (also known as dot zone)
From KB298148
“… This root zone may prevent access to the Internet for DNS and for clients of the DNS. …”
This answer is wrong, must craate a primary zone named “.”
Agree with Doc
Create a primary zone named “.”.
https://www.youtube.com/watch?v=zYXljOcWftE