HTTPDNS ensures high availability in the following ways:
It provides multiple service IP groups for clients. This prevents service interruptions if an individual service IP is blackholed by a DDoS attack or blocked by a carrier.
It uses an Anycast IP network for multi-region deployment. If a node in a single region fails, traffic can seamlessly switch to other regions.
It is deployed independently in multiple availability zones within the same region. This ensures that a failure in a single data center does not cause a service interruption for that region.
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