I've played with switches before, and some DIY electronics, and have done some network admin. I'll grant that the actual internal electronics and software are far to complex for even me to understand.

But again, if you talk to someone with some interest in what you're doing, you can find a level they they can understand. Maybe using metaphors like human-operated old-school telephone switch boards, that's an image that most people will have seen, and can understand at a coarse conceptual level. You CAN have an interesting conversation at the level, if YOU want to be interested in it (and if they do, which is partially contingent on you being able to connect with them in the first place).

If you think climate is simpler or more accessible, I'd suggest you have a quick go at explaining the Navier-Stokes equations, Darcy's law for fluid flow through porous media, or why convective storm activity needs to be parameterised in climate models (and at what scale it doesn't). Climate isn't easier, or more accessible than network admin - both require years or tertiary education to start understanding even parts of the underlying principles, and no one person understands either field completely. It IS probably more familiar for most people, because it's in the media all the time. But again, that's just a matter of finding the extent of their knowledge and interest, and coming up to their level.