An American hacker 'in his pyjamas' has taken down 's internet in revenge for a cyber attack carried out against him by Pyongyang.The hacker, who has been named only as P4x, launched repeated 'distributed denial of service' (DDoS) attacks against the communist state, crippling the country's few government-operated public-access websites and slowing email traffic.DDoS attacks flood a system with fake traffic, consuming available bandwidth and limiting processing capacity of servers so that a website becomes unavailable.
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