Network diagrams are not only handy to have, but provide a vital look at the network topology for your team, your company, and your peace of mind. Let’s look at what a network diagram is, and why it’s so important. A network diagram is, simply put, a schematic or map of your existing network that illustrates the nodes and their connections. Network diagrams are very useful at mapping out your elements and device interactions, as well as illustrating different network topology types.