This 200-301 practice question tests your understanding of network services and security. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. A key principle to apply: oSPF neighbors progress through specific states during adjacency formation, culminating in the FULL state when link-state databases are fully synchronized.. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which OSPF neighbor state indicates that the routers have already exchanged full link-state databases?
2-WAY
Why wrong: 2-WAY means bidirectional hellos, but not full database exchange.
EXSTART
Why wrong: EXSTART is the master-slave negotiation stage.
FULL
FULL indicates the neighbors are fully adjacent.
INIT
Why wrong: INIT means a hello was seen, but bidirectional communication is not confirmed yet.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
FULL
FULL means the adjacency is complete and database synchronization has finished. States such as INIT, 2-WAY, EXSTART, and EXCHANGE all occur earlier in the process.
Key principle: OSPF neighbors progress through specific states during adjacency formation, culminating in the FULL state when link-state databases are fully synchronized.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
2-WAY
Why it's wrong here
2-WAY means bidirectional hellos, but not full database exchange.
When this WOULD be correct
In a different question asking about the state where routers have acknowledged each other as neighbors but have not yet completed the database exchange, the 2-WAY state would be the correct answer. For example, a question could ask which state indicates that routers are ready to proceed with database synchronization.
EXSTART
Why it's wrong here
EXSTART is the master-slave negotiation stage.
When this WOULD be correct
In a question asking about the OSPF state during the database exchange process, specifically regarding the negotiation phase between routers, EXSTART would be the correct answer when identifying the state before the actual database synchronization occurs.
FULL
Why this is correct
FULL indicates the neighbors are fully adjacent.
Related concept
OSPF neighbors progress through specific states during adjacency formation, culminating in the FULL state when link-state databases are fully synchronized.
INIT
Why it's wrong here
INIT means a hello was seen, but bidirectional communication is not confirmed yet.
When this WOULD be correct
In a question asking about the initial state of OSPF neighbor relationships or the process of establishing OSPF adjacencies, INIT could be the correct answer when referring to the very first step of neighbor discovery.
Option-by-option analysis
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The 200-301 exam frequently reuses these exact scenarios with slightly different constraints.
Why this is correct
FULL indicates the neighbors are fully adjacent.
Why this is wrong here
The 2-WAY state indicates that bidirectional communication has been established via Hello packets, but no link-state database exchange has occurred. Full database exchange only happens after the EXSTART and EXCHANGE states.
★ When this WOULD be the correct answer
In a different question asking about the state where routers have acknowledged each other as neighbors but have not yet completed the database exchange, the 2-WAY state would be the correct answer. For example, a question could ask which state indicates that routers are ready to proceed with database synchronization.
Why candidates choose this
Students might confuse 2-WAY with FULL because both indicate a form of adjacency, but 2-WAY is only a preliminary state before database exchange begins.
Why this is wrong here
EXSTART is the state where master-slave relationship is negotiated and initial Database Description (DD) packets are exchanged, but the actual link-state database content has not yet been fully exchanged. Full exchange occurs in the EXCHANGE and LOADING states.
★ When this WOULD be the correct answer
In a question asking about the OSPF state during the database exchange process, specifically regarding the negotiation phase between routers, EXSTART would be the correct answer when identifying the state before the actual database synchronization occurs.
Why candidates choose this
The name 'EXSTART' might be misinterpreted as 'exchange start' implying full exchange, but it is only the beginning of the exchange process.
Why this is wrong here
The INIT state means that a router has received a Hello packet from a neighbor but has not yet seen its own Router ID in the neighbor's Hello, indicating that bidirectional communication is not confirmed. No database exchange occurs in this state.
★ When this WOULD be the correct answer
In a question asking about the initial state of OSPF neighbor relationships or the process of establishing OSPF adjacencies, INIT could be the correct answer when referring to the very first step of neighbor discovery.
Why candidates choose this
INIT might be mistaken for the initial stage of database exchange, but it is actually the very first step in neighbor discovery, far before any database synchronization.
Analysis generated from the official 200-301blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
A frequent exam trap is selecting the 2-WAY or EXSTART states as the answer because they represent important steps in OSPF neighbor formation. However, 2-WAY only confirms bidirectional hello packets without database exchange, and EXSTART is merely the negotiation phase for database synchronization. Choosing these states overlooks the fact that full link-state database exchange and adjacency completion only occur at the FULL state. Misunderstanding this can lead to incorrect assumptions about OSPF neighbor readiness and routing stability.
Detailed technical explanation
OSPF (Open Shortest Path First) is a link-state routing protocol that establishes neighbor relationships through a series of defined states. These states represent the progress of adjacency formation and database synchronization between routers. The process begins with the INIT state, where a router detects a hello packet from a neighbor but has not yet confirmed bidirectional communication. It then moves to the 2-WAY state, confirming bidirectional communication but not yet exchanging routing information. The EXSTART state follows, where routers negotiate master-slave roles to coordinate the database exchange process. The critical state for full adjacency is the FULL state, which signifies that both routers have successfully exchanged their entire link-state databases and are synchronized. This state ensures that both routers have identical topology information, allowing them to make consistent and accurate routing decisions. The transition through these states is essential for OSPF's reliable operation, as it prevents routing loops and inconsistencies by confirming database synchronization before forwarding traffic. A common exam trap is confusing the 2-WAY or EXSTART states with FULL. While 2-WAY confirms bidirectional communication and EXSTART initiates database exchange, neither guarantees complete synchronization. In practical networking, routers in the FULL state can immediately forward traffic based on the synchronized database, whereas routers in earlier states cannot. Understanding these distinctions is vital for troubleshooting OSPF adjacencies and ensuring network stability.
Key takeaway
OSPF neighbors progress through specific states during adjacency formation, culminating in the FULL state when link-state databases are fully synchronized.
Real-world example
A network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
What to study next
Review oSPF neighbors progress through specific states during adjacency formation, culminating in the FULL state when link-state databases are fully synchronized., then practise related 200-301 questions on the same topic to reinforce the concept.
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FAQ
Network Services and Security — This question tests Network Services and Security — OSPF neighbors progress through specific states during adjacency formation, culminating in the FULL state when link-state databases are fully synchronized..
The correct answer is: FULL — FULL means the adjacency is complete and database synchronization has finished. States such as INIT, 2-WAY, EXSTART, and EXCHANGE all occur earlier in the process.
Review oSPF neighbors progress through specific states during adjacency formation, culminating in the FULL state when link-state databases are fully synchronized., then practise related 200-301 questions on the same topic to reinforce the concept.
OSPF neighbors progress through specific states during adjacency formation, culminating in the FULL state when link-state databases are fully synchronized.
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Last reviewed: May 17, 2026
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