#Anonymous hackers have announced "Operation Global Blackout", promising to cause an Internet-wide blackout by disabling the core DNS servers. DNS is the phonebook of the Internet that translates machine names (like "www.facebook.com") to network addresses (like "66.220.158.25"). If hackers can disable the global DNS name system, then typing in your favorite website into your browser will produce an error.
But the attack is no longer practical. It's such a common idea that Wikipedia has a page devoted to it. For something so obvious, defenders have spent considerable time devising solutions. There are many reasons why such an attack won't cause a global blackout.
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