I think there are only two BBE (big bad event) target realms: the physical inter-connections and/or primary reference architecture within the internet, and the power grids that enable the internet to exist.
If you can't power up = no internet
If can power up but can't see ISP = no internet
If you can see ISP but can't resolve DNS = no internet
Rationale: You can't ring-fence fibre-optic cables end-2-end, and 99.999% of users/systems are blind without DNS.
Everything else above that is a function of virtual protective mechanisms and prudent approach, which covers the movie scenario of robbing a bank of 50 billion dollars via a PDA and dial-up modem (e.g. Die Hard 4 showed how stupidity, arrogance and greed lead the way in cork-screwing the internet).
Discussion on:
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