This makes them easy to set up--no tower or central antenna needed--as well as hard to knock out, since if one device goes down, the others will route around it.

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In decentralized and interconnected cyberspace, this requirement is not so easy to satisfy: A cyberattack on a cellphone tower used by the adversary may affect civilian targets along with military ones.

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For those that think it is easy for a Harvard Professor to make such pronouncements from an ivy tower, the book explains that Christensen became a professor after a prior career that included being fired from a company he helped to found.

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