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re: Explain DNS TTL Like I'm five VIEW POST

FULL DISCUSSION
 

SHORT TTL leads to high number of query's to authoritative DNS and have slow propagation over worldwide,while higher TTL value is vice versa.
if you have 2 different subnet wan IP for service, so you can use short TTL value suppose 15 minutes , if one of your service provider is down you can change with another one so downtime is around 15 minutes

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