During the recent DDoS attack on Dyn servers, many websites couldn't be reached for quite a while. However, these websites were resolvable via Google's public DNS servers. I assume IP addresses were cached for a TTL amount of time since last check that was configured by domain owner via Dyn before it went down, is it correct? If so, does it mean that if someone would use Google's public DNS flush cache tool to flush, say, twitter.com, it would become unavailable for everyone who used Google public DNS as a backup to resolve that domain during the Dyn's downtime?
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