If a DNS server is poisoned, it may return an incorrect IP address, diverting traffic to another computer (often an attacker's). When a DNS server has received a false translation and caches it for performance optimization, it is considered poisoned, and it supplies the false data to clients. This means if it receives another request for the same translation, it can reply without needing to ask any other servers, until that cache expires. To increase performance, a server will typically remember (cache) these translations for a certain amount of time. Normally if the server does not know a requested translation it will ask another server, and the process continues recursively. A Domain Name System server translates a human-readable domain name (such as ) into a numerical IP address that is used to route communications between nodes.
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