- A
The OSPF neighbor adjacency is successfully established and is in the FULL state.
The output shows the neighbor state changing to FULL after DBD exchange, indicating a complete adjacency.
- B
The OSPF neighbor is stuck in the 2-Way state due to a mismatched MTU.
Why wrong: The MTU value of 1500 is consistent in both sent and received DBDs; the adjacency progresses to FULL, so MTU mismatch is not an issue.
- C
The OSPF neighbor is in the LOADING state and cannot reach FULL because of a missing network statement.
Why wrong: The neighbor transitions from LOADING to FULL, indicating successful LSA exchange; there is no stuck state.
- D
The OSPF neighbor is in the EXSTART state and is negotiating the master/slave relationship.
Why wrong: The output shows the neighbor already passed EXSTART and EXCHANGE; the final state is FULL, not EXSTART.
Quick Answer
The answer is that the OSPF neighbor adjacency is successfully established and in the FULL state, as confirmed by the debug ip ospf adj output showing the state change from LOADING to FULL. This indicates complete database synchronization, where the routers have exchanged Database Description (DBD) packets—evidenced by the flag 0x7 (master) and flag 0x2 (slave) sequence—and have finished exchanging and acknowledging all Link State Advertisements (LSAs). On the Cisco CCNP ENARSI 300-410 exam, this debug output tests your ability to interpret OSPF neighbor state transitions and verify that the adjacency process has fully completed without errors. A common trap is mistaking the LOADING state for a problem, but the transition to FULL is the goal; the FULL state means the routers have identical LSDBs and are ready to route traffic. Memory tip: think “FULL = Finished Updating Link-state Lists” to recall that FULL follows LOADING only after all LSAs are exchanged and acknowledged.
300-410 Device Access Control Practice Question
This 300-410 practice question tests your understanding of device access control. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. 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.
A network engineer runs the following command to troubleshoot a Device Access Control issue:
R1# debug ip ospf adj
OSPF: 2 Way: DBD with 10.1.1.2 on GigabitEthernet0/0 OSPF: Send DBD to 10.1.1.2 seq 0x1C opt 0x52 flag 0x7 len 32 OSPF: Rcv DBD from 10.1.1.2 seq 0x1C opt 0x52 flag 0x2 len 132 mtu 1500 OSPF: Nbr 10.1.1.2 is FULL, state changed from LOADING to FULL
What does this output indicate?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The OSPF neighbor adjacency is successfully established and is in the FULL state.
The debug output shows the OSPF neighbor transitioning from LOADING to FULL, which confirms that the adjacency has been fully established. The sequence of DBD exchanges (flag 0x7 for master, flag 0x2 for slave) and the final FULL state indicate successful database synchronization, including LSA exchange and acknowledgment.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The OSPF neighbor adjacency is successfully established and is in the FULL state.
Why this is correct
The output shows the neighbor state changing to FULL after DBD exchange, indicating a complete adjacency.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The OSPF neighbor is stuck in the 2-Way state due to a mismatched MTU.
Why it's wrong here
The MTU value of 1500 is consistent in both sent and received DBDs; the adjacency progresses to FULL, so MTU mismatch is not an issue.
- ✗
The OSPF neighbor is in the LOADING state and cannot reach FULL because of a missing network statement.
Why it's wrong here
The neighbor transitions from LOADING to FULL, indicating successful LSA exchange; there is no stuck state.
- ✗
The OSPF neighbor is in the EXSTART state and is negotiating the master/slave relationship.
Why it's wrong here
The output shows the neighbor already passed EXSTART and EXCHANGE; the final state is FULL, not EXSTART.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misinterpretation of the '2 Way: DBD' message, leading candidates to think the neighbor is stuck in the 2-Way state, when in fact the debug output clearly shows the adjacency progressing to FULL.
Trap categories for this question
Command / output trap
The output shows the neighbor already passed EXSTART and EXCHANGE; the final state is FULL, not EXSTART.
Detailed technical explanation
How to think about this question
The OSPF adjacency process involves multiple states: Down, Attempt, Init, 2-Way, ExStart, Exchange, Loading, and Full. The 'flag 0x7' in the DBD packet indicates the master/slave negotiation (bit 0 = I (Init), bit 1 = M (More), bit 2 = MS (Master/Slave)), while 'flag 0x2' indicates a slave response with the More bit set. The MTU value of 1500 in the received DBD is consistent with the interface MTU, and no mismatch is indicated.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
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
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FAQ
Questions learners often ask
What does this 300-410 question test?
Device Access Control — This question tests Device Access Control — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The OSPF neighbor adjacency is successfully established and is in the FULL state. — The debug output shows the OSPF neighbor transitioning from LOADING to FULL, which confirms that the adjacency has been fully established. The sequence of DBD exchanges (flag 0x7 for master, flag 0x2 for slave) and the final FULL state indicate successful database synchronization, including LSA exchange and acknowledgment.
What should I do if I get this 300-410 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.
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