Efficiency and scalability are the key requirements in design of defence against DDoS Attacks.
In this paper illustrate study of various DDOS attack techniques and prevention techniques. All
these method based on filtration mechanism and pattern matching based on the different normal
or abnormal packet pattern. One great advantage of the development of DDoS attack and defence
classifications is that effective communication and cooperation between researchers can be
achieved so that additional weaknesses of the DDoS field can be identified DDoS attacks are not
only a serious threat for wired networks but also for wireless infrastructures.