DNS/providersについて、ここに記述してください。
Four years after the Dyn DDoS attack, critical DNS dependencies have only gone up
If Cloudflare, AWS, or GoDaddy go down, around 40% of the Alexa Top 100,000 websites will also go down with DNS resolution problems.
By Catalin Cimpanu for Zero Day | November 30, 2020 -- 13:36 GMT (21:36 SGT) | Topic: Security
Their findings, published at the Internet Measurement Conference last month, show that, currently, in 2020, 89.2% of all websites use a third-party DNS provider rather than managing their own DNS server.
But even worse is the fact that 84.8% of all analyzed websites relied on one single DNS provider, without having a backup redundancy to which they could switch in case of a failure or attack.