What is the tool Firewalk used for?

What is the tool Firewalk used for?
A . To test the IDS for proper operation
B . To test a firewall for proper operation
C . To determine what rules are in place for a firewall
D . To test the webserver configuration
E . Firewalk is a firewall auto configuration tool

View Answer

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.