EC-Council: Computer Hacking Forensic Investigator(CHFI-V10)
Module 8 : Network Forensics
         
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Question No 112

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QID: 774  
   
John is using Firewalk to test the security of his Cisco PIX firewall. He is also utilizing a sniffer located on a subnet that resides deep inside his network. After analyzing the sniffer log files, he does not see any of the traffic produced by Firewalk. Why is that?


 
A:    Firewalk cannot pass through Cisco firewalls
 
B:    Firewalk sets all packets with a TTL of zero
C:    Firewalk cannot be detected by network sniffers
  
D:    Firewalk sets all packets with a TTL of one
  
         

 
 

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Comunity Comments:

Banwari on 21/05/2025
Opted Answer: D
Firewalk sets all packets with a TTL of one, meaning the packets will expire after passing through a single router. This technique helps determine which ports are open or filtered by the firewall.

That is because sniffer located on a subnet that resides deep inside his network.
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