200-301 · Question #753
When a router undergoes the exchange protocol within OSPF, in what order does it pass through each state?
The correct answer is B. exstart state > exchange state > loading state > full state. During OSPF neighbor adjacency formation, routers sequentially pass through the Exstart, Exchange, Loading, and Full states to establish a master/slave relationship, exchange database summaries, request missing link-state advertisements, and achieve full database synchronization.
Question
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
How the community answered
(43 responses)- A2% (1)
- B95% (41)
- D2% (1)
Why each option
During OSPF neighbor adjacency formation, routers sequentially pass through the Exstart, Exchange, Loading, and Full states to establish a master/slave relationship, exchange database summaries, request missing link-state advertisements, and achieve full database synchronization.
This order incorrectly places the 'loading state' before the 'exchange state' and 'full state', which is not how OSPF establishes adjacency.
The correct order of OSPF neighbor states for establishing full adjacency is: Exstart (master/slave determination and initial DBD exchange), Exchange (full DBD exchange), Loading (requesting and sending missing LSAs), and finally Full (databases are synchronized).
This order incorrectly places the 'full state' before the 'loading state' and 'exchange state', which are essential steps to achieve full adjacency.
This order begins with 'loading state' and places 'exstart state' last, which fundamentally misrepresents the OSPF neighbor state machine process.
Concept tested: OSPF neighbor states adjacency formation
Source: https://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/13685-1.html
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