The answer is that the router is successfully forming an OSPF adjacency with neighbor 10.0.0.2. This is correct because the debug ip ospf adjacency output interpretation shows the complete sequence of OSPF state transitions: from the 2WAY state, through database descriptor (DBD) exchange with the correct sequence number and options, to the SLAVE role in the neighbor negotiation, and finally the Exchange Done state followed by building a router LSA for area 0. Each of these messages confirms that the routers have progressed through the ExStart and Exchange states without errors, culminating in a fully synchronized link-state database. On the Cisco CCNP ENARSI 300-410 exam, this type of output tests your ability to read OSPF adjacency formation step-by-step, often appearing in troubleshooting scenarios where you must distinguish between a successful adjacency and one stuck in a state like 2WAY or ExStart. A common trap is confusing the “2 Way Communication” message with the full adjacency—remember that 2WAY only means bidirectional communication, but the subsequent DBD exchange and “Exchange done” lines prove the adjacency is complete. Memory tip: “2WAY is just hello, DBD means we’re ready to go—Exchange Done means the LSDB is one.”
300-410 Network Logging and Syslog Practice Question
This 300-410 practice question tests your understanding of network logging and syslog. 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 Network Logging and Syslog issue:
R1# debug ip ospf adj
Output:
OSPF: 2 Way Communication to 10.0.0.2 on GigabitEthernet0/0, state 2WAY
OSPF: Send hello to 224.0.0.5 on GigabitEthernet0/0
OSPF: Rcv DBD from 10.0.0.2 on GigabitEthernet0/0 seq 0x1E opt 0x52 flag 0x7 len 32
OSPF: NBR negotiation done. We are the SLAVE
OSPF: Exchange done with 10.0.0.2 on GigabitEthernet0/0
OSPF: Build router LSA for area 0, router ID 10.0.0.1
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The router is successfully forming an OSPF adjacency with neighbor 10.0.0.2.
The debug output shows the OSPF adjacency formation process, including the exchange of database descriptors and LSA building. This indicates successful adjacency formation.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
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 router is successfully forming an OSPF adjacency with neighbor 10.0.0.2.
Why this is correct
The sequence shows 2WAY, DBD exchange, and exchange done, indicating a full adjacency is being established.
The router is experiencing an OSPF authentication failure.
Why it's wrong here
No authentication errors are shown in the output.
✗
The router is stuck in the EXSTART state due to MTU mismatch.
Why it's wrong here
The output shows negotiation done and exchange done, so no MTU issue.
✗
The router is flooding LSAs to all neighbors.
Why it's wrong here
The output shows building a router LSA, which is normal, not flooding.
Common exam traps
Common exam trap: OSPF can fail even when IP connectivity looks correct
OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.
Trap categories for this question
Command / output trap
No authentication errors are shown in the output.
Detailed technical explanation
How to think about this question
OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.
KKey Concepts to Remember
OSPF neighbours must agree on key parameters.
Router ID selection can affect neighbour relationships and LSDB output.
OSPF cost influences the preferred path.
A route can appear in OSPF information but not become the installed route.
TExam Day Tips
→Check area mismatch first when OSPF adjacency fails.
→Review passive interfaces when a network is advertised but no neighbour forms.
→Use show ip ospf neighbor and show ip route clues carefully.
Key takeaway
OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 300-410 OSPF questions on adjacency and route selection.
Network Logging and Syslog — This question tests Network Logging and Syslog — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: The router is successfully forming an OSPF adjacency with neighbor 10.0.0.2. — The debug output shows the OSPF adjacency formation process, including the exchange of database descriptors and LSA building. This indicates successful adjacency formation.
What should I do if I get this 300-410 question wrong?
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 300-410 OSPF questions on adjacency and route selection.
What is the key concept behind this question?
OSPF neighbours must agree on key parameters.
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