In which state do DR and BDR establish adjacency with each OSPF router in the network?
A.
Init State
B.
Exstart State
C.
Exchange State
D.
Loading State
Explanation:
DR and BDR will only establish adjacency with each OSPF router on broadcast
multiacacess networks. So Init state is the correct answer.
Hard to say this is a correct answer.
Two-way: There is bi-directional communication with a neighbor. The router has seen itself in the Hello packets coming from a neighbor. At the end of this stage the DR and BDR election would have been done. At the end of the 2way stage, routers will decide whether to proceed in building an adjacency or not. The decision is based on whether one of the routers is a DR or BDR or the link is a point-to-point or a virtual link.
http://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/7039-1.html#t21