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Configuring routers to not respond to footprinting requests is a countermeasure against:
Spoofing activities
Reconnaissance activities
Sniffing activities
Session hijacking attacks
Foot printing (also known as reconnaissance) is the technique used for gathering information about computer systems and the entities they belong to. To get this information, a hacker might use various tools and technologies. This information is very useful to a hacker who is trying to crack a whole system. When used in the computer security lexicon, "Foot printing" generally refers to one of the pre-attack phases; tasks performed prior to doing the actual attack. Some of the tools used for Foot printing are Sam Spade, nslookup, traceroute, Nmap and neotrace. (source: https://en.wikipedia.org/wiki/Footprinting)
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