Which two are countermeasures that an administrator should employ to protect against DNS tunneling? (Choose two.)

Which two are countermeasures that an administrator should employ to protect against DNS tunneling? (Choose two.)
A . monitor the DNS log for suspicious activities
B . deny all DNS transactions
C . encrypt DNS communications using a hash
D . deploy a solution such as Cisco OpenDNS to block the DNS tunneling traffic

View Answer

Answer: AD