A direct or indirect means of attack modes have been found in the literature and the various types of attacks and their unique features have been extensively studied from the literature. Since the proposed evaluation is based on 119 evolutionary algorithms, the features of the attacks are extremely important to make the system learn and hence self-adapt to varying input attack patterns thus making the system to be intelligent. The last part of this chapter brings out the various defense and attack response mechanisms that have been developed in recent times and the merits and loopholes in existing system have been recorded. The literature survey has been extremely useful in proposing constraint featured defense mechanisms for the incoming DDoS attacks.