CompTIA A+ 220-902 Question I-58

Which of the following describes the function of a firewall?

A. Hardware or software designed to analyze data packets to determine the origin or destination of the packet
B. Hardware or software designed to block packets based on traffic behavior over time
C. Hardware or software designed to compare data packets to known signatures
D. Hardware or software designed to block certain packets from entering or leaving a network

Correct Answer: D