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 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

Implement a Scalable OSPF Based Solution

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

How the community answered

(42 responses)

A
2% (1)
B
95% (40)
D
2% (1)

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.

Topics

#OSPF#adjacency states#exchange protocol#neighbor formation

Community Discussion

No community discussion yet for this question.

Full 200-101 Practice