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The Shield DDoS mitigation systems that protect Amazon Route 53 will rate-limit suspicious queries, preventing them from being served. The customer is responsible for paying for any queries that are not blocked by this system.
The customer may subscribe to AWS Shield Advanced for the Cost Protection feature. If an AWS Shield Advanced customer protects a Route 53 hosted zone and is targeted by an attack that increases their Route 53 utilization, they can request a limited refund of those costs.
See: https://docs.aws.amazon.com/waf/latest/developerguide/request-refund.html for more details.
answered 4 years ago
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