Which method would be MOST effective to evaluate a firewall's weaknesses?

• A. Test by sending large volumes of traffic to overwhelm the device.
• B. Scan for open services using automated port scanners.
• C. Send packets with a hidden payload using allowed ports.
• D. Disable the firewall temporarily to observe normal traffic.

Answer: (C)

Testing firewall weaknesses means probing whether it actually enforces its rules beyond just opening ports. Sending packets with a hidden payload through ports that are allowed puts the firewall’s inspection and filtering capabilities to the test, revealing whether it can detect and block malicious content even when traffic looks legitimate. This approach checks for gaps in rule configurations, insufficient deep packet inspection, or application-layer vulnerabilities that could be exploited to bypass protections. Flooding to overwhelm the device focuses on capacity rather than security policy effectiveness, scanning for open ports maps surface area but doesn’t prove the firewall will block harmful payloads, and disabling the firewall completely defeats the assessment and exposes the system.