International Journal of Computer Applications
Denial-of-Service (DoS) and Distributed Denial-of-Service (DDoS) attacks have been the attack forms with maximum impact on their victims since their origin. The intensity of DDoS attacks is high as the attacker's identity and attack source is safeguarded well behind the bots. Numerous defense mechanisms have been employed to provide robustness against them. In this paper, the authors aim to perform an in-depth study of a few filtering and capability based mechanisms. The advantages and limitations of each along with their architecture and operational services have been discussed in detail.