What technology used in firewalls keeps tracks of conversations so that it knows what to allow back into a network?
A.
stateless packet inspection
B.
stateful packet inspection
C.
NAT filtering
D.
application-level gateway
Explanation:
Section Reference: Defining Firewalls and Other Perimeter Security Devices
A firewall running stateful packet inspection is normally not vulnerable to many attacks because it keeps track
of the state of network connections by examining the header in each packet. It should be able to distinguish
between legitimate and illegitimate packets.