Summary
- Capacity counts are incomplete without physical routes, ownership, power and restoration dependencies.
- The useful map shows where supposedly diverse services converge and who can repair each layer.
Internet infrastructure joins submarine and terrestrial cables, access networks, exchanges, data centres, power and operating teams. A service can buy multiple links while all of them cross the same bridge, landing station or upstream router. Operators and public agencies should map physical paths, control points and repair authority rather than rely on supplier counts. The next evidence is a failover exercise that removes one shared dependency and records what remains reachable. Diversity exists only when an actual fault cannot disable every route at once.
