After discussing the challenges one encounters even in the simplest networking scenario connecting two computers with a cable, we took a short diversion into an exciting complication: what if the two computers are far apart and we can’t pull a cable between them?

Trying to answer that question, we entered the wondrous world of transmission technologies. It’s a topic one can spend a whole life exploring and mastering, so we were not able to do more than cover the fundamentals of modulations and multiplexing technologies.