Distributed Denial of Service (DDoS) Attacks and Defence Mechanism

Denial of Service (DoS) attacks is one of the major threats to Internet sites and one of the major security problems Internet faces today. The nature of threats caused by Distributed Denial of Service (DDoS) attacks on networks. With little or no warning, a DDoS attack could easily destroy its victim's communication and network resources in a short period of time. This paper outlines the problem of DDoS attacks and developing a classification of DDoS attacks and DDoS defense mechanisms. Important features of each attack and defense system category are described and advantages and disadvantages of each proposed scheme are outlined. The goal of the paper is to set a certain order of existence methods of attack and defense mechanisms, for the better understanding DDoS attacks can be achieved with more effective methods and means of self-defense can be developed.