This 300-410 practice question tests your understanding of embedded event manager (eem). Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 on Router R1:
R1# show event manager history events
Event History: No. Time Type Name 1 00:01:30 UTC Mar 1 syslog OSPF_Neighbor_Down 2 00:01:31 UTC Mar 1 syslog OSPF_Neighbor_Up 3 00:01:32 UTC Mar 1 syslog OSPF_Neighbor_Down 4 00:01:33 UTC Mar 1 syslog OSPF_Neighbor_Up
Based on this output, which statement is correct?
The OSPF neighbor is stable.
Why wrong: Alternating down and up events indicate instability.
The OSPF neighbor is flapping.
The rapid succession of down and up events is characteristic of flapping.
The EEM policy is not configured.
Why wrong: Events are being logged, so a policy is configured.
The OSPF neighbor is down permanently.
Why wrong: The up events show it comes back up.
Answer choices
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 is flapping.
The event history shows alternating OSPF neighbor down and up events within seconds, indicating a flapping condition. The correct answer is that the OSPF neighbor is flapping.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
The OSPF neighbor is stable.
Why it's wrong here
Alternating down and up events indicate instability.
The OSPF neighbor is flapping.
Why this is correct
The rapid succession of down and up events is characteristic of flapping.
Related concept
OSPF neighbours must agree on key parameters.
The EEM policy is not configured.
Why it's wrong here
Events are being logged, so a policy is configured.
The OSPF neighbor is down permanently.
Why it's wrong here
The up events show it comes back up.
Common exam traps
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
The up events show it comes back up.
Detailed technical explanation
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.
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
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 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
Embedded Event Manager (EEM) — This question tests Embedded Event Manager (EEM) — OSPF neighbours must agree on key parameters..
The correct answer is: The OSPF neighbor is flapping. — The event history shows alternating OSPF neighbor down and up events within seconds, indicating a flapping condition. The correct answer is that the OSPF neighbor is flapping.
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.
OSPF neighbours must agree on key parameters.
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Last reviewed: Jun 18, 2026
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