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TCP/IP Guide by Charles M. Kozierok

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DNS Name Server Caching

Most of the grunt work done by name servers is responding to name resolution requests. Busy servers—like the root name servers, the ones that carry zone information for the TLDs, and ones that serve very busy zones—must handle hundreds or even thousands of name resolution requests each second. Each of these requests takes time and resources to resolve and takes internetwork bandwidth away from the business of transferring data. It is essential, therefore, that DNS server implementations employ mechanisms to improve their efficiency and cut down on unnecessary name resolution requests. One of the most important of these is caching.

Name Server Caching

The word cache refers to a store, or a place where something is kept. In ...

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