A network graph depicts seven Indian cities as nodes connected by seven routes, with each city rendered as a distinct SVG symbol shape—circle, square, diamond, triangle, star, cross, or wye—in its own color. The layout is computed using `d3.forceSimulation` with `forceLink`, `forceManyBody`, and `forceCenter`, while `d3.drag` enables interactive repositioning. Routes appear as gray lines whose positions update on each simulation tick, and city labels are placed beside the symbols.