AWS Secondary Domain Name Service
Description:
A secondary DNS provides redundancy in case the primary DNS server goes down. If there is no secondary server, when the primary fails, the website will become unavailable at its human-readable domain name (although it will still be accessible by its IP).
DNS servers are exposed to security threats, first and foremost Distributed Denial of Service attacks (DDoS). Setting up an external DNS provider with DDoS protection as a secondary DNS, is a common way to detect DoS attacks.
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