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
Answer: D
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