Secondary DNS allows your domain zone file to be backed up automatically and stored on a secondary server. If one provider is unreachable, the other will systematically step in to answer the queries.
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Infrastructure and DNS Redundancy is Key to Preventing Outages
According to Alexa, out of the 75K top ranking domains, 346 of them are managed by Dyn and experienced a complete outage yesterday due to their lack of DNS redundancy. While 346 out of 75K doesn’t sound like a lot, it is when you consider the amount of people that frequent the sites affected. Large websites such as Indeed, Chewy, Carvana, Fandom, Houzz, Sephora, and Credit Karma to name a few, took a considerable hit from this latest debacle.
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