- A
The environment variables show that a syslog event with mnemonic ADJCHG triggered, and the applet can use these variables in actions.
Correct. The variables show the event details, and applets can reference them using $_syslog_msg, etc.
- B
The environment variables are configured manually by the engineer to define the applet behavior.
Why wrong: Incorrect. Environment variables are automatically set by EEM when an event triggers, not configured manually.
- C
The output shows the current state of all EEM applets and their variables.
Why wrong: Incorrect. This shows environment variables from the last triggered event, not all applets.
- D
The _exit_status variable indicates the applet failed to execute.
Why wrong: Incorrect. _exit_status of 1 typically indicates success, not failure. A value of 0 might indicate failure in some contexts.
Quick Answer
The answer is that the output indicates a syslog event with mnemonic ADJCHG triggered the EEM applet, and these environment variables are automatically populated for use in the applet’s actions. This is correct because when an EEM event occurs, Cisco IOS automatically sets predefined environment variables like `_event_type`, `_syslog_msg`, and `_syslog_mnemonic` to capture the event’s context. On the CCNP ENARSI 300-410 exam, understanding `show event manager environment all` is crucial for troubleshooting EEM applets, as it reveals exactly which variables are available after a trigger—a common trap is assuming these variables are manually configured, when they are dynamically generated by the event detector. A key memory tip: think of these variables as the “event’s fingerprint”—they are read-only snapshots that let your applet react intelligently, so always check them first when an applet misbehaves.
300-410 Embedded Event Manager (EEM) Practice Question
This 300-410 practice question tests your understanding of embedded event manager (eem). 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 an EEM issue:
R1# show event manager environment all
No. Variable Name Value 1 _exit_status 1 2 _event_type syslog 3 _syslog_msg %OSPF-5-ADJCHG: Process 1, Nbr 10.0.0.2 on GigabitEthernet0/0 from LOADING to FULL, Loading Done 4 _syslog_severity 5 5 _syslog_facility OSPF 6 _syslog_mnemonic ADJCHG
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 environment variables show that a syslog event with mnemonic ADJCHG triggered, and the applet can use these variables in actions.
The output shows the EEM environment variables that are set when an event triggers an applet. These variables contain information about the event, such as the event type, syslog message details, and exit status. This is useful for debugging applets that use these variables in their actions.
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 environment variables show that a syslog event with mnemonic ADJCHG triggered, and the applet can use these variables in actions.
Why this is correct
Correct. The variables show the event details, and applets can reference them using $_syslog_msg, etc.
Related concept
OSPF neighbours must agree on key parameters.
- ✗
The environment variables are configured manually by the engineer to define the applet behavior.
Why it's wrong here
Incorrect. Environment variables are automatically set by EEM when an event triggers, not configured manually.
- ✗
The output shows the current state of all EEM applets and their variables.
Why it's wrong here
Incorrect. This shows environment variables from the last triggered event, not all applets.
- ✗
The _exit_status variable indicates the applet failed to execute.
Why it's wrong here
Incorrect. _exit_status of 1 typically indicates success, not failure. A value of 0 might indicate failure in some contexts.
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
Incorrect. This shows environment variables from the last triggered event, not all applets.
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?
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 environment variables show that a syslog event with mnemonic ADJCHG triggered, and the applet can use these variables in actions. — The output shows the EEM environment variables that are set when an event triggers an applet. These variables contain information about the event, such as the event type, syslog message details, and exit status. This is useful for debugging applets that use these variables in their actions.
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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Last reviewed: Jun 18, 2026
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