The correct answer is that the router is experiencing network instability causing repeated neighbor state changes. This conclusion is drawn directly from the output of the **show event manager history events** command, which reveals a rapid sequence of syslog events—EIGRP neighbor down and OSPF neighbor flap—occurring within seconds of each other. When **diagnosing network flapping with EEM event history**, this pattern indicates that the router’s interfaces or links are unstable, triggering repeated adjacency resets across multiple routing protocols. On the Cisco CCNP ENARSI 300-410 exam, this scenario tests your ability to interpret EEM event logs to differentiate between isolated failures and systemic flapping; a common trap is to focus on a single protocol event rather than the broader pattern of rapid, alternating neighbor losses. Remember the memory tip: “If timestamps tick like a clock, flapping’s the lock”—tightly clustered events across protocols always point to physical or Layer 1 instability, not a protocol-specific bug.
300-410 Embedded Event Manager (EEM) Practice Question
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 EIGRP_Neighbor_Down
2 00:01:31 UTC Mar 1 syslog OSPF_Neighbor_Flap
3 00:01:32 UTC Mar 1 syslog EIGRP_Neighbor_Down
4 00:01:33 UTC Mar 1 syslog OSPF_Neighbor_Flap
Based on this output, what is the most likely problem?
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 the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The router is experiencing network instability causing repeated neighbor state changes.
The 'show event manager history events' command shows the last triggered events. The output shows repeated syslog events for EIGRP neighbor down and OSPF neighbor flap within a short timeframe, indicating a flapping condition. The correct answer is that the router is experiencing network instability causing repeated neighbor state changes.
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 EEM policies are not configured correctly.
Why it's wrong here
The policies are triggering, so they are configured correctly.
✓
The router is experiencing network instability causing repeated neighbor state changes.
Why this is correct
The repeated events within seconds indicate flapping, likely due to link issues or routing problems.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Events are being triggered, so policies are active.
✗
The syslog server is not reachable.
Why it's wrong here
The events are logged locally; syslog reachability is not indicated.
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.
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.
Embedded Event Manager (EEM) — This question tests Embedded Event Manager (EEM) — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: The router is experiencing network instability causing repeated neighbor state changes. — The 'show event manager history events' command shows the last triggered events. The output shows repeated syslog events for EIGRP neighbor down and OSPF neighbor flap within a short timeframe, indicating a flapping condition. The correct answer is that the router is experiencing network instability causing repeated neighbor state changes.
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.
About these practice questions
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These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. 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?
medium
A.The OSPF neighbor is stable.
✓ B.The OSPF neighbor is flapping.
C.The EEM policy is not configured.
D.The OSPF neighbor is down permanently.
Why B: 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.
Last reviewed: Jun 18, 2026
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