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What is DNS Poisoning?

Domain Name System (DNS) poisoning is an attack where the DNS table in a server is modified so that someone who thinks they are accessing a legitimate Web site is actually directed toward a fraudulent site. In this method of pharming, individual personal computer host files are not corrupted. Instead, the problem occurs in the DNS server, which handles thousands or millions of Internet users' requests for URLs. Victims end up at the bad web sites without any visible indicator of a discrepancy. 

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