DNS explained

Hello! DNS explained

I hope to get DNS explained in this thread. DNS explained

Is there a central DNS archive that registrars report to and that ISPDNS explained DNS servers update against?

Why is it sometimes taken 24 hours and sometimes 72 hours, why ain't all DNS servers updated at least once a day?

Does it cost more for a registrar to update the info often?

I find this very interesting, please explain.

 

 

 

 

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