CompTIA A+ (220-901) — Question 18

Which of the following network devices filters traffic of many different protocols based on a predetermined set of rules established by a system administrator?

Answer options

• A. Proxy
• B. Switch
• C. Firewall
• D. Router

Correct answer: C

Explanation

The correct answer is C, Firewall, because it specifically monitors and controls incoming and outgoing network traffic based on security rules. A Proxy (A) acts as an intermediary for requests from clients seeking resources from other servers, while a Switch (B) connects devices within a network and operates at the data link layer. A Router (D) directs data packets between different networks but does not inherently filter traffic based on rules.