A fixed network is like a fuse box with groups; it is not one entity, but it is almost always segmented in order to channel all data. It is not a matter of plugging in cables and that's it. Planning and control are necessary to make everything work properly. You do that with VLANS, QoS, Spanning Tree etc; not so simple. Monitoring data for security and detecting possible problems is also essential if you have problems. Also, if things go wrong with connected devices, cables or defective equipment, you need to have insight so you can react quickly. To gain this insight, you must be able to see live usage and all settings. And not just over a single device but over the entire network. So it is really complex if you want to do it right.