A network tree rendered as a force-directed graph shows six named nodes and five weighted links, with each node placed using a physics simulation. The visualization loads data from a local JSON file and uses two D3 versions: `d3.layout.force` from d3.v2 for the force simulation, and d3.v4 for DOM selection and SVG creation. Nodes appear as gray circles with labels, while link thickness encodes the weight value from the data. The SVG output updates positions on each tick of the force layout, producing an organic tree-like structure centered on the root node.