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A Distributed Denial of Service (DDoS) attack aims to intentionally deprive legitimate users of a resource (or service) provided by a system, typically by overloading that system with a flood of data packets from multiple sources. Attackers normally create a denial of service (DoS) condition by either breaking down the communication channel to the server (by consuming server bandwidth), or by bringing down the server completely or impairing its efficiency considerably. This can be accomplished by exploiting vulnerability in the server or by consuming server resources (e.g., memory, hard disk, etc.).
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