Distributed denial of service attacks, in which hackers use a targeted hose of junk traffic to overwhelm a service or take a server offline, have been a digital menace for decades. But in just the last 18 months, the public picture of DDoS defense has evolved rapidly. In fall 2016, a rash of then-unprecedented attacks caused internet outages and other service disruptions at a series of internet infrastructure and telecom companies around the world.
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