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Disruption of service caused by distributed denial of services (DDoS) attacks is an increasing problem in the Internet world. At the present time, to attack the victim's system, the attacker uses sophisticated automated attacking tools for DDoS attack, but earlier it was performed either by manually or by semi automated attacking tools. These attack tools are used to attack various Internet sites. In this paper, we present a literature on classification of available mechanisms for DDoS defense. These defense mechanisms are used to prevent, detect, response and tolerate the DDoS attacks. It is well known that it is very difficult to stop the DDoS attack, therefore, it would be better to maximize the fault tolerance and quality of services under variety of intrusions and attacks. In our analysis, we will discuss the merits and demerits of each mechanism over others. In addition, this paper provides better understanding of the DDoS attack problem and enables a security administrator to cope up against the DDoS threat.