Your network contains a server named Server1 that runs a Server Core installation of Windows
Server 2008 R2. Server1 is configured as a DNS server. You need to ensure that Server1 only resolves
name queries from IPv6 clients. What should you do?

A.
Run netsh.exe and specify the dnsclient parameter.

B.
Run dnscmd.exe and specify the /config parameter.

C.
Run dnscmd.exe and specify the /resetlistenaddresses parameter.

D.
Run netsh.exe and specify the interface parameter.

Explanation:
To configure your DNS server to listen over IPv6, do the following:
Install Windows Support Tools.
For more information, see Install Windows Support Tools
Open Command Prompt.
Type the following command:
dnscmd /config /EnableIPv6 1
Restart the DNS Server service.
For more information, see Start or stop a DNS server.
http://technet.microsoft.com/en-us/library/cc783049(WS.10).aspx