Exam 312-50v10 topic 1 question 131 discussion

Actual exam question from ECCouncil's 312-50v10

Question #: 131
Topic #: 1

What is the way to decide how a packet will move from an untrusted outside host to a protected inside that is behind a firewall, which permits the hacker to determine which ports are open and if the packets can pass through the packet-filtering of the firewall?

A. Session hijacking
B. Firewalking
C. Man-in-the middle attack
D. Network sniffing

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Suggested Answer: B 🗳️

by TrendMicroDLPSSucks at July 30, 2020, 12:05 p.m.

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TrendMicroDLPSSucks

Highly Voted 10 months, 2 weeks ago

Firewalk is an active reconnaissance network security tool that attempts to determine what layer 4 protocols a given IP forwarding device 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 hostdoes not allow the traffic, it will likely drop the packets on the floor and we will see no response. To get the correct IP TTL that will result in expired packets one beyond the gateway we need to ramp up hop-counts. We do this in the same manner that traceroute works. Once we have the gateway hopcount (at that point the scan is said to be `bound`) we can begin our scan. It is significant to note the fact that the ultimate destination host does not have to be reached. It just needs to be somewhere downstream, on the other side of the gateway, from the scanning host.

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