Firewalls are used to provide network security throughout an enterprise and to control what information can be accessed--and to a certain extent, through what means. Which of the following is NOT something that firewalls are concerned with? 

Answer options:

A. IP address
B. Encryption
C. Port
D. Protocol

B

Firewalls work at the network level and control traffic based on the source, destination, protocol, and ports. Whether or not the traffic is encrypted is not a factor with firewalls and their decisions about routing traffic. Firewalls work primarily with IP addresses, ports, and protocols.