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Much has been written about the differences between conventional IT networks and operational technology (OT) or industrial control system (ICS) networks: patching is harder in OT networks, antivirus is harder, OT networks use very old protocols and computers, and there is enormous resistance to change from the people who manage these networks. These differences are, however, all superficial. The intrinsic difference between these two kinds of networks is consequences: most often, the worst-case consequences of cyberattacks are sharply, qualitatively different on IT versus OT networks.