Hackers on Tuesday launched a denial-of-service attack against at least three of the 13 root servers that maintain the Internet’s domain name system. The attacks, which lasted for 12 hours, reportedly targeted the server that maintains the dot-org suffix, and the servers at the Department of Defense and the Internet Corporation for Assigned Names and Numbers. The attacks were largely unsuccessful — and reportedly less serious than a similar attack in 2002 — as most Internet users hardly noticed any impact.

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