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

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.