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A surge from a lightning strike near my home travelled over the cable line to kill a network switch and the WAN port on a firewall. (Strangely, the cable modem was spared.)

Everything was on a decent UPS... but I’d completely forgotten the cable line.

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Most of the UPSs and surge protectors I've seen for home use include coax, ethernet, and/or telephone protection, too, e.g., https://www.apc.com/shop/us/en/products/APC-Performance-Surg...

Lighting is pretty rough.

You can completely air gap your network from the outside line by converting to fiber at some point (probably between your cable modem and your router, in a DOCSIS setup). Isn't foolproof, because lightning can induce current on your wires directly, but it'll help these kinds of scenarios.

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