How Amazon Shield detects events - Amazon WAF, Amazon Firewall Manager, and Amazon Shield Advanced
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How Amazon Shield detects events

Amazon operates service-level detection systems for the Amazon network and individual Amazon services, to ensure that they remain available during a DDoS attack. Additionally, resource-level detection systems monitor each individual Amazon resource to ensure that traffic toward the resource remains within expected parameters. This combination protects both the targeted Amazon resource and Amazon services, by applying mitigations that drop known bad packets, highlight potentially malicious traffic, and prioritize traffic from end users.

Detected events appear in your Shield Advanced event summaries, attack details, and Amazon CloudWatch metrics as either the name of the DDoS attack vector or as Volumetric if the evaluation was based on traffic volume instead of signature. For more information on the attack vector dimensions that are available within the DDoSDetected CloudWatch metric, see Amazon Shield Advanced metrics