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How the internet DNS query works

Last Modified: 2012-06-27
I have internet DNS servers by which i am managing my domains.
I do also have secondary DNS services from my ISP DNS servers.
My query is when a query for any dns resolution comes to my DNS servers it checks for cache. if present it will reply. If it does not have the cache which dns server will it query it further and how.
Will it query my secondary DNS service DNS servers or some other servers.
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