Network DDOS defence measures of attacks and performance evaluations

The paper analyses the theories and modes of DDOS attacks,compares with DDOS defense measures which emphases on technology.It raises the defense measures of whole and its part,takes comprehension approaches to macrocosm aeroes and strategies of microcosrnic process protection to part.On this basis,it integrates performance evalutions in relate to DDOS attacks and DDOS defence measures.