DENIAL OF SERVICE ATTACKS

This paper describes the most common types of DoS, including the latest one, named Distributed Reflection Denial of Service. The operation of the Internet’s TCP protocol is followed by complete explanation on how several types of DoS work. Bandwidth and CPU load are very important aspects on how the resources are delivered by the servers. Therefore an attack that produces load on any of the two resources – bandwidth and processing power – can cause valid traffic not to obtain useful service, because of the malicious attack. The crucial fact is that the world is changing rapidly and the world's Internet of today and tomorrow is not the Internet of yesterday. Therefore we must be one step behind (if not forward) any attacker, in order to be prepared and make our servers stay live on the Internet.