Date Added: Apr 2010
A Denial-of-Service (DoS) attack occurs when traffic is sent from one host to another computer with the intent of disrupting an online application or service. A Distributed Denial-of-Service (DDoS) attack occurs when multiple hosts are leveraged to carry out and amplify an attack. Attackers usually create the denial-of-service condition by either consuming server bandwidth or by impairing the server itself. Typical targets include Web servers, DNS servers, application servers, routers, firewalls, and Internet bandwidth.