The answer is that a track object referencing the IP SLA operation is missing. Without a track object, the IP SLA reaction configuration, which uses the `triggerOnly` action type, has no mechanism to influence routing decisions or other network behavior. The `triggerOnly` action simply fires an internal event when the timeout threshold is crossed, but it is the track object that listens for that event and changes its state (up/down), which can then be used by policy-based routing, static routes, or HSRP. On the ENCOR 350-401 exam, this is a classic trap: candidates often configure the IP SLA probe and the reaction correctly but forget the critical `track` command that ties the probe to a real-world action. A common memory tip is "Track to Act"—the IP SLA probes, the reaction triggers, but only the track object makes it actually do something useful.
CCNP IP SLA Practice Question
This 350-401 practice question tests your understanding of ip sla. 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.
Examine this IP SLA configuration on Router R1:
ip sla 4
icmp-echo 10.4.4.4
frequency 10
ip sla schedule 4 life forever start-time now
ip sla reaction-configuration 4 react timeout threshold-type immediate action-type triggerOnly
Which of the following is missing from this configuration to make it useful for tracking?
A 'track' object that references the IP SLA operation is missing.
The 'track' command (e.g., 'track 1 ip sla 4') is needed to link the IP SLA reaction to a tracking object that can be used by routing protocols or other features.
B
The 'frequency' command is missing; it should be set to 60 seconds.
Why wrong: The frequency is correctly set to 10 seconds; the default is 60, but it is explicitly configured.
C
The 'ip sla responder' must be configured on the target router.
Why wrong: For ICMP echo, a responder is not required; it uses standard ICMP.
D
The 'life' parameter should be set to a specific number of repetitions.
Why wrong: 'life forever' is valid and means the operation runs indefinitely.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A 'track' object that references the IP SLA operation is missing.
IP SLA reaction configurations need to be associated with a tracking object to be useful for actions like route manipulation. Without 'track', the trigger has no effect.
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.
✓
A 'track' object that references the IP SLA operation is missing.
Why this is correct
The 'track' command (e.g., 'track 1 ip sla 4') is needed to link the IP SLA reaction to a tracking object that can be used by routing protocols or other features.
Related concept
Read the scenario before looking for a memorised answer.
✗
The 'frequency' command is missing; it should be set to 60 seconds.
Why it's wrong here
The frequency is correctly set to 10 seconds; the default is 60, but it is explicitly configured.
✗
The 'ip sla responder' must be configured on the target router.
Why it's wrong here
For ICMP echo, a responder is not required; it uses standard ICMP.
✗
The 'life' parameter should be set to a specific number of repetitions.
Why it's wrong here
'life forever' is valid and means the operation runs indefinitely.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 350-401 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
Got this wrong? Here's your next step.
Identify which 350-401 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
IP SLA — This question tests IP SLA — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: A 'track' object that references the IP SLA operation is missing. — IP SLA reaction configurations need to be associated with a tracking object to be useful for actions like route manipulation. Without 'track', the trigger has no effect.
What should I do if I get this 350-401 question wrong?
Identify which 350-401 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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