The OSPF packets shown have been exchanged between two neighbors. What state is the OSPF adjacency in?
A.
The adjacency state is two way because both routers have received a database description packet.
B.
The adjacency is in the exchange state. The next step is to exchange link state request and link state update packets.
C.
The adjacency is in the ex start state. The routers have exchanged database description packets, but still have to negotiate the starting sequence number.
D.
The adjacency state is full. The routers are exchanging database description packets to notify each other that all link state advertisements have been received.
Comprehensive and Detailed Explanation From Exact Extract:
FromNokia 7750 SR OS OSPF Guide — OSPF Neighbor State Machine Section:
“During the Exchange state, routers exchange Database Description (DBD) packets containing summaries of LSAs. Sequence numbers and flags are used to coordinate this exchange.”
Both routers are sendingDR_DESC (Database Description)packets.
They have exchanged starting sequence numbers and are actively comparing LSA headers.
Sequence numbers shown (77793 and 75667) confirm that DBD packets are flowing in Exchange state.
Thus, correct answer isB.
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