Date Added: Mar 2012
DDoS attack is a form of DoS attack in which attacker uses authorized user IP address to attack on a particular victim. Of the two types of attack it falls in the active category. The main aim of the attacker is to jam the resources in order to deny services to the recipient. The attacker can use several strategies to achieve this goal, one of which is by flooding the network with bogus requests. The attack is distributed because the attacker is using multiple computers to launch the denial of service attack. In this paper the authors have first identified the types of DoS and DDoS attack. Then they have provided the solution for those attacks on the basis of attacker's identification.