A _____ uses hardware or software to create a barrier that prevents unwanted messages or instructions from entering a computer system.
A) router
B) data mine
C) spyware
D) firewall

Question

Quizplus · Accepted Answer

A firewall is a security tool that controls network traffic, monitoring it and filtering out malicious data. It can be implemented as either hardware or software, and can be customized according to a user's needs. A firewall helps to prevent unauthorized access to a computer system and protects against threats such as viruses and hackers.

A _____ Uses Hardware or Software to Create a Barrier