Which one of the following is not a primary component or aspect of firewall systems?

A.
Protocol filtering

B.
Packet switching

C.
Rule enforcement engine

D.
Extended logging capability

Explanation:
This is not a main function of a firewall, packet switching is a main feature of a
Switch (working only in the layer 2 of the OSI model). Firewall are network security devices that
can function through layer 2 to layer 7 of the OSI model. They usually include rule engine that
enforce the enterprise security policy of the company. They provide protocol filtering to enforce our
requirements through the forwarded or deny of traffic. They also provide logging capabilities so we
can analyze what is happening in a very low level in our network.