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Covad: Rise and fall of a Net star

The communications company has gone from one of Silicon Valley's most promising upstarts to a poster child for the collapse of the Internet bubble.

    After Bob Knowling Jr. lost his job last November, he tried to get high-speed Internet service installed at his home in Arizona. Covad Communications was a natural first choice, considering that Knowling had been employed by the broadband company--as its chief executive.