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Dictionary :: Definition :: DDoS

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DDoS

DDoS (Distributed Denial of Service) is a type of DOS attack where multiple compromised systems, which are often infected with a Trojan, are used to target a single system causing a Denial of Service (DoS) attack. Victims of a DDoS attack consist of both the end targeted system and all systems maliciously used and controlled by the hacker in the distributed attack.

In a DDoS attack, the incoming traffic flooding the victim originates from many different sources: potentially hundreds of thousands or more. This effectively makes it impossible to stop the attack simply by blocking a single IP address; plus, it is very difficult to distinguish legitimate user traffic from attack traffic when spread across so many points of origin.

Last Revised: 2015-11-01

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