As to lessons to forget, my colleague Morgen Witzel suggested that a classic military example is the Maginot Line.

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The original Maginot Line failed during World War II because the German Army went around it, through Belgium, and soon ended up in Paris.

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To date, U.S. cyber efforts have been focused mainly on defensive measures, seeking to repel network intruders in a fashion that Alexander likens to the famously failed Maginot Line.

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