This is the best explanation:
http://www.joystiq.com/2014/08/24/ps...o-ddos-attack/
Quote:
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It's worth noting that this attack, if true, is not comparable to the 2011 PSN outage. Whereas the incident three years ago was due to compromised systems and an intrusion into Sony servers, a DDoS attack is much simpler, and basically floods the targeted network with data so that it can't make new connections to legitimate users.
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I don't think Arya Stark would be alone in assuming this is another hack attempt, based on history. Sony hasn't really done enough to let customers know what's going on. In addition, there are some counter-measures they could have taken beforehand to avoid this.