Table 8-4 OSPF Neighbor States

Question 1

Down

Answer 1

This is the initial state of a neighbor relationship. It indicates that the router
has not received any OSPF hello packets.

Question 2

Attempt

Answer 2

This state is relevant to NBMA networks that do not support broadcast
and require explicit neighbor configuration. This state indicates that no
information has been received recently, but the router is still attempting
communication

Question 3

Init

Answer 3

This state indicates that a hello packet has been received from another router,
but bidirectional communication has not been established.

Question 4

2-Way

Answer 4

Bidirectional communication has been established. If a DR or BDR is needed,
the election occurs during this state

Question 5

ExStart

Answer 5

This is the first state in forming an adjacency. Routers identify which router
will be the master or slave for the LSDB synchronization.

Question 6

Exchange

Answer 6

During this state, routers are exchanging link states by using DBD packets

Question 7

Loading

Answer 7

LSR packets are sent to the neighbor, asking for the more recent LSAs that
have been discovered (but not received) in the Exchange state.

Question 8

Full

Answer 8

Neighboring routers are fully adjacent.