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Target customers: 1. Users who require ensured DDoS mitigation effects. After DDoS attacks are launched against your service and blackhole filtering is triggered, you can add your service to an Anti-DDoS Pro instance of the Advanced mitigation plan to obtain best effort protection. 2. Users who want to reduce the costs of purchasing high basic protection bandwidth to mitigate volumetric DDoS attacks. 3. Users who want to control costs of burstable protection used to mitigate volumetric DDoS attacks. Burstable protection is billed on a pay-as-you-go basis. Features released: 1. Two advanced mitigation sessions are provided free of charge to an Anti-DDoS Pro instance of the Advanced mitigation plan per month. One advanced mitigation session is consumed 24 hours after best effort protection is triggered. 2. Global advanced mitigation sessions can be purchased. Global advanced mitigation sessions are shared by all Anti-DDoS Pro instances of the Advanced mitigation plan within your Alibaba Cloud account.