The figure illustrates that, after the summary route is configured, the routing tables of R1 and R2 no longer include the individual 192.168.1.0/24, 192.168.2.0/24, and 192.168.3.0/24 networks. Instead, they show a single summary route of 192.168.0.0/22. Summary routes reduce the number of total routes in routing tables, which makes the routing table lookup process more efficient. Summary routes also require less bandwidth utilization for the routing updates, because a single route can be sent instead of multiple individual routes.