[m463]

it would be interesting to find out just how much would survive.

ok, maybe not "find out" but... speculate?

Cellular networks have been resilient because they're possibly distributed mesh networks. I'm pretty sure the carriers have some gurus who officially or unofficially have figured out what happens.

DSL/cable type networks might be different.

I'm pretty sure dns and similar systems are widely distributed.

I wonder if a proper analogy might be the roadways. Even though one road or freeway might be blocked, people will be able to drive around and (maybe) get through. Who knows, maybe there are some "blocked mountain crossing" equivalents with the internet.

On a personal level, a laptop, a cloned git repository and a solar panel. :)