例1:You are the administrator for a Windows2000 network.Your internal DNS server is located behind a firewall.When you test your DNS server by using the Monitoring tab on the server's properties page, the DNS server passes the simple test but fails the recursive test.
What should you do?
A.Run ipconfig/registerdns.
B.Delete the %systemroot%\system32\dns\cache.dns file.
C.Copy the %systemroot%\system32\dns\samples\cache.dns file to %systemroot%\system32\dns,and overwrite the existing cache.dns file.
D.Create a forward lookup zone for the root zone.Name the forward lookup zone.
E.Create a reverse lookup zone for the subnet on which the resource records for the primary name servers are located.