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GIAC Exam GCIH Topic 6 Question 44 Discussion

Actual exam question for GIAC's GCIH exam
Question #: 44
Topic #: 6
[All GCIH Questions]

Firewalking is a technique that can be used to gather information about a remote network protected by a firewall. This technique can be used effectively to perform information gathering attacks. In this technique, an attacker sends a crafted packet with a TTL value that is set to expire one hop past the firewall. Which of the following are pre-requisites for an attacker to conduct firewalking?

Each correct answer represents a complete solution. Choose all that apply.

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Suggested Answer: A, B, D

by Juan at Jul 10, 2025, 11:33 AM

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Bernardine
1 days ago
I think the attacker needs to know the IP address of a host behind the firewall.
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Ashton
23 days ago
Haha, a backdoor? What is this, a spy movie? I doubt that's a prerequisite for firewalking. Maybe the attacker could try knocking on the firewall's door instead.
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Teddy
26 days ago
B is also important, right? If ICMP packets are blocked, the attacker won't be able to get the TTL information they need.
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Aron
29 days ago
Hmm, I think the correct answers are A and D. Knowing the IP address of the host and the last gateway is crucial for this technique to work.
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Bernardo
18 days ago
ICMP packets leaving the network being allowed is not a prerequisite for firewalking.
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Xuan
26 days ago
Yes, you are correct. Knowing the IP address of the host and the last gateway is essential for firewalking.
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