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The level of DDoS protection that applies to web ACLs associated with Application Load Balancers. ACTIVE_UNDER_DDOS protection is enabled by default whenever a web ACL is associated with an Application Load Balancer. In the event that an Application Load Balancer experiences high-load conditions or suspected DDoS attacks, the ACTIVE_UNDER_DDOS protection automatically rate limits traffic from known low reputation sources without disrupting Application Load Balancer availability. ALWAYS_ON protection provides constant, always-on monitoring of known low reputation sources for suspected DDoS attacks. While this provides a higher level of protection, there may be potential impacts on legitimate traffic.