Which of the following firewalls inspects the actual contents of packets?

Which of the following firewalls inspects the actual contents of packets?

Which of the following firewalls inspects the actual contents of packets?

A.
Packet filtering firewall

B.
Application-level firewall

C.
Circuit-level firewall

D.
Stateful inspection 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 C 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 D 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.
Reference:
“http://en.wikipedia.org/wiki/Firewall_(networking)#Third_generation_-_application_layer”



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