Which of the following is NOT a type of malware?

Which of the following is NOT a type of malware?

• A. Viruses
• B. Worms
• C. Trojan horses
• D. Firewall

Answer: (D)

Malware is software designed to harm, steal, or gain unauthorized access, and the items that fit that description include viruses, worms, and Trojan horses. A virus attaches itself to a host program and spreads when that program runs; a worm copies itself across networks without user action; a Trojan horse disguises itself as something legitimate to trick you into executing it. A firewall, by contrast, is a defensive tool that monitors and controls incoming and outgoing network traffic to block unauthorized access. It doesn’t spread, replicate, or cause damage itself; its purpose is to prevent harm. So the firewall is not malware.

Malware is software designed to harm, steal, or gain unauthorized access, and the items that fit that description include viruses, worms, and Trojan horses. A virus attaches itself to a host program and spreads when that program runs; a worm copies itself across networks without user action; a Trojan horse disguises itself as something legitimate to trick you into executing it. A firewall, by contrast, is a defensive tool that monitors and controls incoming and outgoing network traffic to block unauthorized access. It doesn’t spread, replicate, or cause damage itself; its purpose is to prevent harm. So the firewall is not malware.