Also, DNS caches are just locally used small subsets. Global lookups are again hierarchical, thats why it is called _domain_ name system. Thats why there are do

Also, DNS caches are just locally used small subsets. Global lookups are again hierarchical, thats why it is called _domain_ name system. Thats why there are dots in the adresses. Also, DNS lookups are rare compared to IP route lookups, you look at DNS for every connection at most, limited by the TTL for caches. Route lookups happen for every packet.