- A
The OSPF MIB is not supported or not loaded on the router.
Some routers require the 'snmp-server enable traps ospf' command or the OSPF process to be configured to load the OSPF MIB; otherwise, the MIB objects are not available.
- B
The community string 'public' is not allowed to access the OSPF MIB due to a missing 'snmp-server view' command.
Why wrong: By default, the community string 'public' uses the default view, which includes most MIB objects; a specific view exclusion would be needed to block OSPF.
- C
OSPF neighbor states are only available via SNMPv3 due to security restrictions.
Why wrong: OSPF MIB objects are accessible via SNMPv2c if the MIB is loaded and the view permits it.
- D
The NMS must use the OSPF process ID in the OID to poll neighbor states.
Why wrong: The OID for OSPF neighbor states includes the neighbor IP address, not the process ID; the NMS should use the correct OID.
Quick Answer
The answer is that the OSPF MIB is not supported or not loaded on the router. While SNMPv2c with the community string 'public' typically grants read-only access to standard MIB objects like interface statistics, the OSPF MIB is a separate, protocol-specific module that must be explicitly loaded and supported in the router’s IOS image. Even if the community string is correct, the NMS will receive no response for OSPF neighbor states if the router does not have the OSPF MIB loaded or if the view-based access control (VACM) excludes those objects. On the Cisco CCNP ENARSI 300-410 exam, this scenario tests your understanding that SNMP MIB availability is not guaranteed by a simple community string—it depends on both the IOS feature set and the MIB’s presence in the running configuration. A common trap is assuming that a working community string means all MIBs are accessible, but OSPF-specific MIBs like OSPF-MIB require the router to be running an IP routing feature set. Memory tip: “OSPF MIB is a loaded module, not a given right.”
300-410 SNMP Troubleshooting Practice Question
This 300-410 practice question tests your understanding of snmp troubleshooting. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
An engineer configures SNMPv2c with a read-only community string 'public' on a router. The NMS can poll interface statistics, but when trying to poll OSPF neighbor states, the NMS receives no response. Which is the most likely explanation?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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 MIB is not supported or not loaded on the router.
SNMP view-based access control (VACM) can restrict which MIB objects are accessible. The default view for SNMPv2c includes many objects, but OSPF MIB objects may be excluded if the view is customized or if the OSPF MIB is not loaded.
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 OSPF MIB is not supported or not loaded on the router.
Why this is correct
Some routers require the 'snmp-server enable traps ospf' command or the OSPF process to be configured to load the OSPF MIB; otherwise, the MIB objects are not available.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
OSPF neighbours must agree on key parameters.
- ✗
The community string 'public' is not allowed to access the OSPF MIB due to a missing 'snmp-server view' command.
Why it's wrong here
By default, the community string 'public' uses the default view, which includes most MIB objects; a specific view exclusion would be needed to block OSPF.
- ✗
OSPF neighbor states are only available via SNMPv3 due to security restrictions.
Why it's wrong here
OSPF MIB objects are accessible via SNMPv2c if the MIB is loaded and the view permits it.
- ✗
The NMS must use the OSPF process ID in the OID to poll neighbor states.
Why it's wrong here
The OID for OSPF neighbor states includes the neighbor IP address, not the process ID; the NMS should use the correct OID.
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.
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.
What to study next
Got this wrong? Here's your next step.
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.
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FAQ
Questions learners often ask
What does this 300-410 question test?
SNMP Troubleshooting — This question tests SNMP Troubleshooting — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: The OSPF MIB is not supported or not loaded on the router. — SNMP view-based access control (VACM) can restrict which MIB objects are accessible. The default view for SNMPv2c includes many objects, but OSPF MIB objects may be excluded if the view is customized or if the OSPF MIB is not loaded.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
OSPF neighbours must agree on key parameters.
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Last reviewed: Jun 18, 2026
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