As a securing consultant, what are some of the things you would recommend to a company to
ensure DNS security? Select the best answers.

A.
Use the same machines for DNS and other applications

B.
Harden DNS servers

C.
Use split-horizon operation for DNS servers

D.
Restrict Zone transfers

E.
Have subnet diversity between DNS servers

Explanation:

A is not a correct answer as it is never recommended to use a DNS server for any other
application. Hardening of the DNS servers makes them less vulnerable to attack. It is
recommended to split internal and external DNS servers (called split-horizon operation). Zone
transfers should only be accepted from authorized DNS servers.
By having DNS servers on different subnets,you may prevent both from going down,even if one of
your networks goes down.