[Noumenon]

Shutting down Level 3, MCI and AT&T will completely disrupt if not halt almost all internet,

Yep - look for the bottlenecks or focal points. That's where the kill switches will be. It's too easy.

[stefanbatory]

this requires a network without bottlenecks and focal points. Perhaps many distributed mobile data-handling nodes that have their own independent power source. Something like that would be as difficult to kill as a Soviet truck-mounted mobile ICBM...