Please use this for questions.
Answer:
ICMP.
Explanation:
Hackers might use ICMP for gain knowledge about current system addresses and specific procedures as part of a reconnaissance process.
ICMP is a failure informing system used by network protocols such as routers to produce warning to that of the source Address while network issues interrupt IP packet transmission.
I found this:
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I found it here:
http://www.informit.com/articles/article.aspx?p=675274&seqNum=3
