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content/notes/11-DNS.md
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@ -72,6 +72,8 @@ tags:
> e.g., server1 becomes server1.otago.ac.nz
> resource records have different types
> this allow sthe BIND to know which is which
> need to set TTL of file. set the time for every record. Time to Live. e.g., 3 days. dns records are forgotten"flushed" after TTL has passed. after this they need to request the address again from the root nameserver
> if you change ip address you might have to wait for 3days for everyones record of you to be changed. while changing you should have two nameservers → one for the old and one for the new
> [!INFO] types of server
> primary - one which most of the time is working