Networks are complex; even the simple ones can be. There are lots of reasons for this. For one it is just mind boggling how much engineering has to go into even the simplest network device. It would take an entire book just to describe in detail how a Raspberry PI works including the circuit diagrams, components, microcode, interfaces and a PI is practically a trinket in computer complexity. Beyond the complexity of the devices though is the number of paths that lead onto the network.
