Robustness of the internet at the AS level by DDoS attack

In this paper, we discuss the robustness of connectivity at the AS level of the Internet for DDoS attacks. Distributed denial of service attacks (DDoS) occur when the bandwidth or resources of a targeted system are flooded, usually one or few more servers becomes dysfunction. DDoS Attack is attacked by using DNS servers or slave PCs by computer viruses , etc. as an attack amplifier. We paid attention to DDoS multiple system, and examined the influence of the network topology. This attack method corresponds to the nearest neighborhoods connections attack. And, it is shown to be able to give the network serious damage for a very simple attack.