- A
The IP SLA operation is missing the 'ip sla reaction-configuration' command to trigger SNMP traps when the threshold is exceeded.
IP SLA traps require a reaction configuration that specifies the threshold and action (e.g., 'ip sla reaction-configuration 1 react timeout threshold 100 action trapOnly'). Without it, no traps are sent.
- B
The NMS is not configured to receive IP SLA traps.
Why wrong: The NMS receives all traps, but the router is not generating them.
- C
The SNMP community string is incorrect for trap sending.
Why wrong: The community string is configured globally, and the NMS can poll, so community is fine.
- D
The IP SLA operation is not scheduled correctly.
Why wrong: The operation shows 'Over threshold', so it is running and detecting threshold crossings.
IP SLA Traps Not Sent: Missing reaction-configuration
This 300-410 practice question tests your understanding of snmp troubleshooting. 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.
Router R8 is configured with SNMP and IP SLA. The IP SLA operation sends SNMP traps to the NMS when a threshold is crossed. The configuration includes: ip sla 1, icmp-echo 192.168.1.1, threshold 100, timeout 1000, frequency 10, ip sla schedule 1 life forever start-time now, snmp-server enable traps ip sla. However, the NMS receives no traps when the threshold is crossed. The IP SLA operation shows 'Over threshold' in show ip sla statistics. What is the root cause?
Quick Answer
The answer is that the IP SLA operation is missing the `ip sla reaction-configuration` command to trigger SNMP traps when the threshold is exceeded. This is correct because while `snmp-server enable traps ip sla` globally enables trap generation for IP SLA, each individual operation must also be explicitly told which condition—such as a threshold crossing—should trigger a trap. Without the `reaction-configuration` command, the router knows the threshold has been crossed (as shown in `show ip sla statistics`), but it has no instruction to send a trap to the NMS. On the Cisco CCNP ENARSI 300-410 exam, this scenario tests your understanding of the two-part trap configuration: global enablement plus per-operation reaction. A common trap here is assuming the global command alone is sufficient. Remember the memory tip: “Global enables the gun, reaction pulls the trigger.”
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 IP SLA operation is missing the 'ip sla reaction-configuration' command to trigger SNMP traps when the threshold is exceeded.
The correct answer is A because the 'ip sla reaction-configuration' command is required to define the condition (e.g., threshold violation) that triggers an SNMP trap. Without this command, the IP SLA operation can detect and report 'Over threshold' in statistics, but it has no mechanism to generate an SNMP trap to the NMS. The 'snmp-server enable traps ip sla' command only enables the router to send IP SLA traps globally; it does not link a specific reaction to the threshold event.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 IP SLA operation is missing the 'ip sla reaction-configuration' command to trigger SNMP traps when the threshold is exceeded.
Why this is correct
IP SLA traps require a reaction configuration that specifies the threshold and action (e.g., 'ip sla reaction-configuration 1 react timeout threshold 100 action trapOnly'). Without it, no traps are sent.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The NMS is not configured to receive IP SLA traps.
Why it's wrong here
The NMS receives all traps, but the router is not generating them.
- ✗
The SNMP community string is incorrect for trap sending.
Why it's wrong here
The community string is configured globally, and the NMS can poll, so community is fine.
- ✗
The IP SLA operation is not scheduled correctly.
Why it's wrong here
The operation shows 'Over threshold', so it is running and detecting threshold crossings.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between enabling SNMP traps globally ('snmp-server enable traps ip sla') and configuring the specific reaction that triggers those traps ('ip sla reaction-configuration'), leading candidates to overlook the missing reaction command.
Trap categories for this question
Command / output trap
The operation shows 'Over threshold', so it is running and detecting threshold crossings.
Detailed technical explanation
How to think about this question
The 'ip sla reaction-configuration' command creates a reaction that monitors a specific condition (e.g., threshold exceeded) and triggers an action, such as sending an SNMP trap. Without this command, the IP SLA probe only logs the event locally. In real-world deployments, this is a common misconfiguration where engineers enable global trap generation but forget to bind the reaction to the specific SLA operation, leading to silent failures in monitoring systems.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 300-410 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Questions learners often ask
What does this 300-410 question test?
SNMP Troubleshooting — This question tests SNMP Troubleshooting — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The IP SLA operation is missing the 'ip sla reaction-configuration' command to trigger SNMP traps when the threshold is exceeded. — The correct answer is A because the 'ip sla reaction-configuration' command is required to define the condition (e.g., threshold violation) that triggers an SNMP trap. Without this command, the IP SLA operation can detect and report 'Over threshold' in statistics, but it has no mechanism to generate an SNMP trap to the NMS. The 'snmp-server enable traps ip sla' command only enables the router to send IP SLA traps globally; it does not link a specific reaction to the threshold event.
What should I do if I get this 300-410 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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