200-101 Question #225: Real Exam Question with Answer & Explanation

The correct answer is B: exstart state > exchange state > loading state > full state. During OSPF database exchange between two neighbors, the process passes through these states in order: (1) ExStart - routers elect a master and slave and agree on a starting sequence number using empty DBD packets; (2) Exchange - routers exchange DBD (Database Description) packet

Question

When a router undergoes the exchange protocol within OSPF, in what order does it pass through each state?

Options

Aexstart state > loading state > exchange state > full state
Bexstart state > exchange state > loading state > full state
Cexstart state > full state > loading state > exchange state
Dloading state > exchange state > full state > exstart state

Explanation

During OSPF database exchange between two neighbors, the process passes through these states in order: (1) ExStart - routers elect a master and slave and agree on a starting sequence number using empty DBD packets; (2) Exchange - routers exchange DBD (Database Description) packets listing their LSA headers; (3) Loading - routers send LSR (Link State Request) packets to request full copies of LSAs they are missing, and receive LSU (Link State Update) replies; (4) Full - both routers have synchronized LSDBs and are fully adjacent.

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