Final answer:
In IPv6, all routes are level 3 ultimate routes, which means each entry in the routing table is directly usable to forward packets without additional hierarchy or levels.
Step-by-step explanation:
In IPv6, all routes are level 3 ultimate routes. An ultimate route is a routing table entry that contains either a direct interface route or a remote route that can be used to forward packets. IPv6 has simplified the routing process by eliminating the need for level 1 and level 2 routes, which were present in earlier networking protocols like IPv4, in favor of a flat routing structure where all routes are considered level 3.