A computer network diagram is a schematic depicting the nodes and connections amongst nodes in a computer network or, more generally, any telecommunications network. Computer network diagrams form an important part of network documentation.
Before you set up a complex network of servers, routers, and firewalls, you should map out your plans with a network diagram. Visually laying out your network architecture gives you a chance to make sure you’ve thought through every device or component to ensure the entire system works properly.
A network diagram shows how computers and network devices (e.g. router, switch, etc) connect within a network. A typical use of a network diagram is for tracking down network issues by studying how the computers and devices are connected and inter-related.