That and they control all the big communication companies, so there's any number of ways. DNS does come to mind first. They could probably have Cisco and other companies disable every switch, router, modem, and other ISP connection device, using IS backdoors. The speculation has always been that at some point there will be a black out period for communications and power.
How does one accomplish that?
They’d attack the big dns resolvers probably
That and they control all the big communication companies, so there's any number of ways. DNS does come to mind first. They could probably have Cisco and other companies disable every switch, router, modem, and other ISP connection device, using IS backdoors. The speculation has always been that at some point there will be a black out period for communications and power.