Eccouncil Exam ECSS Topic 4 Question 28 Discussion

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.