Date Added: Dec 2011
Distributed Denial-of-Service (DDoS) is an increasingly worrying threat to availability of Internet resources. DDoS Attacks have recently emerged as one of the most newsworthy, if not the greatest weaknesses of the Internet. DDoS attacks cause economic losses due to the unavailability of services and potentially serious security problems due to incapacitation of critical infrastructures. The goal of the paper is to place some order into the existing attack, defense principles and classification of DDoS prevention mechanisms so that a better understanding of DDoS attacks can be achieved.