Which of the following firewalls inspects the actual contents of packets?
A.
Packet filtering firewall
B.
Stateful inspection firewall
C.
Application-level firewall
D.
Circuit-level firewall
Explanation:
The application level firewall inspects the contents of packets, rather than the
source/destination or connection between the two. An
Application level firewall operates at the application layer of the OSI model.
Answer option D is incorrect. The circuit-level firewall regulates traffic based on whether or not a
trusted connection has been established. It
operates at the session layer of the OSI model.
Answer option A is incorrect. The packet filtering firewall filters traffic based on the headers. It
operates at the network layer of the OSI model.
Answer option B is incorrect. The stateful inspection firewall assures the connection between the
two parties is valid and inspects packets
from this connection to assure the packets are not malicious.