The formidable threat to internet world is distributed denial of service (DDoS) attacks. In this paper, we present the evolutionary scenario of attacks back from the history to till date. This paper highlights the state-of-the art technology perpetrated by the attackers so far and what are the defense strategies we possess currently in order to counter such attacks. Also, we emphasize the open issues, research, challenges in the context of defense mechanisms against the attacks. The significant purpose of this paper is to create awareness about DDoS attacks in this cyber era for naive users of internet as well as for the security practitioners to comprehendthe updates about DDoS attacks. © Research India Publications.