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中文摘要：
网络抽象促使软件定义网络（software-defined networking,简称SDN）的产生.SDN将数据平面与控制平面解耦合,简化了网络管理.首先从SDN诞生发展的背景入手,梳理了SDN的体系结构,包括数据层、控制层和应用层,并按照SDN的层次结构深入阐述其关键技术,特别分析了一致性、可用性和容错性等特性.然后,论述了SDN在不同应用场景下的最新研究成果.最后,展望未来研究工作.
英文摘要：
Network abstraction brings about the naissanee of software-defined networking. SDN decouples data plane and control plane, and simplifies network management. The paper starts with a discussion on the background in the naissance and developments of SDN, combing its architecture that includes data layer, control layer and application layer. Then their key technologies are elaborated according to the hierarchical architecture of SDN. The characteristics of consistency, availability, and tolerance are especially analyzed. Moreover, latest achievements for profiled scenes are introduced. The future works are summarized in the end.
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