"Lesson #3: Recovery from the widespread destruction of digital systems would be extremely challenging.

Replacing 5% of the world’s connected devices would require around 71 million new devices. It would be impossible for manufacturers to rapidly scale up production to meet demand, particularly if manufacturing and logistics systems were affected. For systems that survive, there would be a significant bottleneck in patching and reinstallation.

The geographic concentration of electronics manufacturing would create other challenges. In 2018, China produced 90% of mobile phones, 90% of computers and 70% televisions. Finger-pointing about the source and motive of the cyberattack, as well as competition to be first in line for supplies, would inevitably lead to geopolitical tensions."

This is how they will take down the internet.

Big tech will take part in this little "cyber attack".
Many devices will be infected, probably from malware and backdoors into operating systems.

Due to the rate of infection, ISPs will be ORDERED to "switch off" until further notice.