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The DNS "Time To Live" (TTL)
Posted by admin on 11 September 2009 09:38 PM
Each part of DNS information that may be cached separately has a time to live associated with it. Once this time expires, the cached information must be discarded and has to be obtained from an authoritative server again if it is needed. The TTL is not configured locally in the caching server but is set in the authoritative server and passed along with the information itself. This way the administrator of a domain can control how long it takes for any change to be known throughout the Internet.
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