If users use Alibaba Cloud Anti-DDoS Basic service, when the attack traffic exceeds the service upper limit, the black hole policy will then be triggered; after that, the users’ servers can still provide services at a limited speed.
When the black hole policy is triggered by excessive DDoS traffic, the affected server is temporarily isolated from the network to prevent further damage. During this period, no services are available, meaning the server cannot provide limited-speed services.
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