Raul wants to ensure that a hacker cannot access his DNS zone files. What action should he take
at the firewall?

A.
Disable nslookup on all hosts in the network, then disable named on the DNS server at certain
times to thwart illicit zone transfers.

B.
Configure all routers to block zone transfers and encrypt zone transfer messages.

C.
Configure the firewall to accept zone transfer requests only from specific hosts.

D.
Filter TCP port 53, but allow UDP port 53 so that only certain DNS hosts can authenticate at the
firewall.