Which statement best describes the primary purpose of firewalking?

Which statement best describes the primary purpose of firewalking?

• A. To perform banner guiding responses
• B. To test firewall vulnerability and map routers
• C. To spoof IP addresses
• D. To obscure IDS logs

Answer: (B)

Firewalking is a reconnaissance technique that probes the boundary of a network by sending TTL-limited probes toward a target network behind a firewall. By watching how the firewall and upstream routers respond to these probes, you can determine which ports and protocols the firewall allows through and, as a result, infer what devices or segments exist beyond the firewall. This is why it’s described as testing firewall rules and mapping routers behind the boundary. It isn’t about grabbing service banners, spoofing IP addresses, or hiding IDS logs, which are different tactics with other aims.

Firewalking is a reconnaissance technique that probes the boundary of a network by sending TTL-limited probes toward a target network behind a firewall. By watching how the firewall and upstream routers respond to these probes, you can determine which ports and protocols the firewall allows through and, as a result, infer what devices or segments exist beyond the firewall. This is why it’s described as testing firewall rules and mapping routers behind the boundary. It isn’t about grabbing service banners, spoofing IP addresses, or hiding IDS logs, which are different tactics with other aims.