GIAC
GCIH · Question #163
GCIH Question #163: Real Exam Question with Answer & Explanation
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Reconnaissance, Scanning, and Enumeration
Question
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.
Options
- AAn attacker should know the IP address of a host located behind the firewall.
- BICMP packets leaving the network should be allowed.
- CThere should be a backdoor installed on the network.
- DAn attacker should know the IP address of the last known gateway before the firewall.
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Topics
#firewalking#TTL manipulation#firewall reconnaissance#ICMP