Which of the following is a type of packet filtering used by firewalls that retains memory of the packets that pass through the firewall?
A. Stateless packet filter
B. Circuit-level gateway
C. NAT filtering
D. Stateful packet inspection
Answer: D
Which of the following is a type of packet filtering used by firewalls that retains memory of the packets that pass through the firewall?
A. Stateless packet filter
B. Circuit-level gateway
C. NAT filtering
D. Stateful packet inspection