Certified Ethical Hacker (CEH v10) — Question 81

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

Correct answer: B

Explanation

The correct answer is B, Firewalking, which is a technique used to determine which ports are open on a firewall by analyzing the responses to specially crafted packets. Session hijacking (A) and man-in-the-middle attacks (C) refer to different forms of attacks that exploit active sessions or intercept communications, while network sniffing (D) involves capturing packets on a network but does not specifically focus on traversing firewalls.