Question: 21
What is the tool Firewalk used for?
A. To exam the IDS for proper operation
B. To exam a firewall for proper operation
C. To determine what rules are in place for a firewall
D. To exam the webserver configuration
E. Firewalk is a firewall auto configuration tool
Answer: C
Explanation:
Firewalk is an active reconnaissance network security tool that attempts to determine what layer
4 protocols a given IP forwarding device "firewall" will pass. Firewalk works by sending out TCP
or UDP packets with a TTL one greater than the targeted gateway. If the gateway allows the
traffic, it will forward the packets to the next hop where they will expire and elicit an
ICMP_TIME_EXCEEDED message. If the gateway host does not allow the traffic, it will likely
drop the packets and no response will be returned.
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