In 2016, Dyn, a provider of managed DNS servers, was the victim of a massive DDoS attack that crippled the company’s operations and took down domain-name-resolving operations for more than 175,000 websites.
While some sites managed to stay up by activating a redundancy and switching DNS resolving to secondary servers, many websites were not prepared and remained down for almost a day as Dyn dealt with the attack.
Four years later, a team of academics from Carnegie Mellon University have conducted a large-scale study of the top 100,000 websites on the internet to see how website operators reacted to this attack and how many are still operating with one single DNS provider and no other backup.
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Source: ZDNet