Hello everyone. There is a couple questions about OSPF topology. As it known, ABR routers - routers which connect its area to zero area. For example, 0,1,2 areas, and there is only 1 ABR router on each area, then there is only 2 ABR could bi in this topology. But could be another connections between other router from 1 area to router from 0? It might work like just simply route, don't send LSA, working like ABR, but it can work like simple route? Or there is no other connection between 1 and 0 but ABR connection? Second question is same, - could it be connection between 1 and 2 and work as simply route, not like ABR, or it is not?