Which of the following firewall types keeps track of each ongoing dialog between internal and external systems?
A.
Packet filtering
B.
Circuit-level proxy
C.
Stateful
D.
Application-level proxy
Explanation:
Stateful firewalls use state tables to keep track of each step of
communication between systems. This provides a higher level of protection than
packet filtering, because it makes access decisions based on the steps that have
already been completed in the dialog.