jcom.5.2.13903 A Classification of DDoS Attacks and its Approach for Attack Prevention M. CHAITANYA KISHORE REDDY SUNIL KUMAWATH T. GOWTHAM SAI KRISHNA T.M. SNEHA Journal on Computer Science 2347–6141 5 2 1 7 10.26634/jcom.5.2.13903 DDoS Attacks, Flooding Attack, Classifications, Tools, Algorithms Currently, distributed denial of service attack (DDoS) is a very serious threat in the internet. Large number of packets are send to a victim to jam the traffic so that the attacker can use the data of the victim. Various attack methods, its mechanisms, flooding attacks etc (Mirkovic and Reiher, 2005) are briefed in this paper. The scopes of DDOS attacks, measures and solutions to the attacks are hereby explored with effectiveness in various attack scenarios. A Distributed Denial-of-Service (DDoS) attack is an attack where the perpetrator uses more than one unique IP address, often thousands of them. Attacks may involve forging sender's Internet Protocol (IP) addresses (IP address spoofing) as an alternative or augmentation of DDoS, making it difficult to identify and defeat the attack. For specific targeted purposes, including disrupting transactions and accessing databases, an application layer DDoS attack is done, which requires less resource and often accompanies network layer attacks. June - August 2017 Copyright © 2017 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=13903