Started a Computer Networking course at Coursera. This isn’t a network technician course, this is more of a theory course, explaining how they work. To use a car analogy, CompTia Network + is like learning to change the oil on your car. This Computer Networks course is more about learning to design a combustion chamber inside the engine.
That said, this should have a lot of knowledge useful to a Network+ or a Cisco cert… which will be useful things for job searches.
Right now, I’m workign through the basics of sockets. The associated text has a simple file transfer application used as an example. It’s in C, which I don’t really know well, but it’s simple enough to follow along with.