This is known as a Distributed Denial of Service (DDoS) attack.
The source of a DoS attack can be a geographically diverse set of traffic originators all sending packets to a single target.
DoS attacks can also manifest with transmitting a deluge of packets or opening many connections to a target system, overwhelming it to the point of saturating its capacity and consuming all its available resources, thus rendering it unusable. Other DoS attacks can involve an attacker gaining access to the target system, taking control of it and shutting it down. The attack can be a single “silver bullet” packet sent to a system that disrupts a service and crashes it. Denial of Service (DoS) attacks are malicious acts that prevent the utilization of an IT system.
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