A network diagram visualizes communication between servers, proxies, and devices. Nodes are positioned manually using pixel coordinates on a dark background, with Font Awesome icons indicating node type and connecting paths rendered as SVG curves using D3’s `linkVertical` template. Hovering over a node triggers a tooltip, and links are colored light grey with arrows showing direction. The source data is a hardcoded JavaScript object defining nodes and links, and the example uses D3 v6 to select the SVG element and append the tooltip.