Certified Ethical Hacker (CEH) — Question 65

What is the way to decide how a packet will move from an untrusted outside host to a protected inside that is behind a firewall, which permits the hacker to determine which ports are open and if the packets can pass through the packet-filtering of the firewall.

Answer options

• A. Firewalking
• B. Session hijacking
• C. Network sniffing
• D. Man-in-the-middle attack

Correct answer: A

Explanation

The correct answer is Firewalking, as it is a technique used to determine which ports are open on a firewall and how packets can traverse it. Session hijacking, network sniffing, and man-in-the-middle attacks do not specifically involve probing firewalls to map out open ports or the packet-filtering behavior.