How did hackers crash Twitter?

How did hackers crash Twitter?

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Last week, millions of people around the world experience severed attacks of panic as Twitter blacked out for hours.

It even seemed, for a while, that Facebook would be next, and that the end of civilization was well nigh.

Everything turned out all right, of course, and we were told that Twitter had simply experienced a denial of service attack.

But exactly happens during such an attack, and how does it bring down a web site? To talk about this subject, we have on the show S. Maheswaran, national manager for strategic accounts at Websense, which specializes in web security gateway software.