Which routing technique requires the lowest amount of router RAM consumption?

Default routing requires the least amount of RAM consumption because one routing statement is required for all of the upstream networks. This type of routing technique is best used on stub network routers. RIP routing requires an amount of RAM to hold its learned routes. OSPF requires a substantial amount of RAM because it holds learned routes and calculates the shortest path to remote networks. Static routing requires RAM for each route configured manually compared to default routing, which only requires one static entry.