When a router undergoes the exchange protocol within OSPF, in what order does it pass through each state?
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A. B. C. D.B
The correct answer is A. exstart state > loading state > exchange state > full state.
Explanation:
When a router undergoes the exchange protocol within OSPF (Open Shortest Path First), it passes through four different states. These states are:
exstart state: In this state, the two routers that are trying to establish an adjacency agree on their router IDs and exchange their initial sequence numbers.
exchange state: In this state, the routers exchange database description packets (DBDs) that contain information about their LSAs (Link State Advertisements).
loading state: In this state, the router that received the DBD packets requests the missing LSAs from the other router and begins receiving them.
full state: In this state, the routers have exchanged all of their LSAs and have established a complete OSPF database. They can now forward traffic through their network.
So, the correct order in which a router passes through each state during the OSPF exchange protocol is exstart state > loading state > exchange state > full state, which is option A.