the TwoWay state is a legal state for neighbors to be in on multiaccess segments like Ethernet.
Consider a case where you have 4 routers on a LAN, A, B, C and D. A is the DR and B is the BDR. In such a case, router C's neighbor state for each neighbor will be as follows:
A - Full
B - Full
D - TwoWay
Each non-DR/non-BDR router will be in a Full state with the DR and BDR but will be in the TwoWay state with other non-DR routers. That simply means that the router has two-way communication with that neighbor but has not established a full adjacency with it, since the router will only establish adjacencies with the DR and BDR.
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