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With the growth in network industry, traditional network is being replaced with Software Defined Network. SDN is growing technology, which provides the control of network communication flexible. SDN decouples into three planes namely control plane, data plane and application plane, making it centralized. Due to centralization, the network is cost effective, dynamic and resource management is efficient. Network administrators believes that SDN has a breakthrough in network industry due to programmability and remote accessing while network providers appreciate SDN as it has reduced capital expenditure (CAPEX) and operational expenditure (OPEX). In spite of vast capabilities, the SDN face security issues as it has complex architecture and centralization feature. The SDN introduces network security challenges among which Distributed Denial of Service has devastating effect on the entire network. In SDN …