Cloud computing has started to gain acceptance for adoption and implementation among organizations, however, this new technology area has already started to deal with security, performance and availability challenges. Within Cloud Security issues being paramount for the corporates, private enterprises, the denial of service attacks are rated as the highest priority threat to the cloud environments. This study presents a review on the academic literature research work on the DDoS attack on Cloud, introduces a new DDoS Classification taxonomy and proposes parameters for determining an effective DDoS solution.