"DDoS attacks...will generally fall into one of three broad categories:
Volumetric Attacks: Attempt to consume the bandwidth either within the target network/service, or between the target network/service and the rest of the Internet. These attacks are simply about causing congestion."
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According to http://www.arbornetworks.com/attack-ddos:
"DDoS attacks...will generally fall into one of three broad categories:
Volumetric Attacks: Attempt to consume the bandwidth either within the target network/service, or between the target network/service and the rest of the Internet. These attacks are simply about causing congestion."