Back when I used to work at a chemical plant, we had two networks: one for regular corporate/internet access, and one for plant control. The later was physically isolated from the former, which is why scenarios like Die Hard 4 are so hilarious. You can't hack a plant control system from outside because that network is physically isolated.
Anyway, I hope this same practice is used in this standard, where critical control systems are physically isolated from these external communication systems.
Anyway, I hope this same practice is used in this standard, where critical control systems are physically isolated from these external communication systems.