This example shows a network diagram of three nodes labeled MAIN, SUB, and PROX1, connected by TCP links with port labels. The visualization uses D3 v6 and SVG rendering to display the diagram. Nodes are rendered as circles with Font Awesome icons, and the code implements drag-and-drop functionality with `d3.drag()`. Hovering over a node displays a tooltip with listener details, while a `d3.forceSimulation` with link and body forces is configured but set to zero strength.