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.