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DNS cache poisoning is a maliciously created or unintended situation that provides data to a caching name server that did not originate from authoritative Domain Name System (DNS) sources. This can happen through improper software design, misconfiguration of name servers, and maliciously designed scenarios exploiting the traditionally open architecture of the DNS system.
A domain name server translates a domain name (such as www.example.com) into an IP address that Internet hosts use to contact Internet resources. If a DNS server is poisoned, it may return an incorrect IP address, diverting traffic to another computer.
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