On an OSPF broadcast multi-access network, what is the final adjacency state between two routers that are neither the Designated Router (DR) nor the Backup Designated Router (BDR)?
Down
2-Way
ExStart
Full
The correct answer is 2-Way. On OSPF broadcast networks (and other multi-access types), routers elect a Designated Router (DR) and a Backup Designated Router (BDR) to reduce the number of adjacencies and limit LSA flooding. All routers on the segment form a full adjacency with the DR and the BDR. However, routers that are not the DR or BDR (known as DROTHERs) will only form a 2-Way adjacency with each other. In the 2-Way state, they see each other's Hello packets but do not proceed to exchange their Link-State Databases (LSDBs).
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