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The distributed denial of server (DDoS) attack is a major threat to the Internet.Numerous works have been proposed to deal with this problem through attack detection and defense mechanism design.A survey was presented to introduce the DDoS defense technologies,from the traditional strategies,through Cloud-based systems,toward SDN-based mechanisms.According to the characteristics of DDoS attack,the features and drawbacks of these systems were discussed,which could provide new insights for the development of the new generation of network security framework in the future.