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Evolution of smart cities induces critical challenges related to cyber and network security. The increased reliance of a smart city on Information and Communication Technologies (ICT) infrastructure improves automation, efficiency, and sustainability of city services. However, it also poses enormous challenges for ensuring continued operations and services at all times and especially under cyber-attacks. Any lapse in cyber security can lead to critical disaster across the city. Distributed Denial of Service (DDoS) attacks are considered to be the most predominant and prevalent cyber-attacks. We believe that smart city could consist of numerous applications with varying level of network and security requirements. Therefore, providing an adaptive mechanism against DDoS attacks for all applications in a smart city is a key challenge. Further, considering the wide-scale requirements of a smart city, developing an adaptive …