- A
The IP SLA is not configured with the vrf CUSTOMER keyword, so the probe is sent in the global table and cannot reach the target in the VRF.
The IP SLA must be VRF-aware to send probes within the VRF; otherwise, the probe fails and the track goes down, but the route might still be installed due to other factors.
- B
The MPLS label distribution is failing, causing the IP SLA probe to be dropped.
Why wrong: The MPLS network is operational per the scenario.
- C
The source IP 192.168.1.1 is not in the VRF CUSTOMER, so the probe cannot be sourced correctly.
Why wrong: The source IP can be in the global table; the issue is the probe is not sent in the VRF.
- D
The track 8 is not supported for VRF routes.
Why wrong: Track with IP SLA is supported for VRF routes if configured correctly.
Quick Answer
The answer is that the IP SLA probe is not configured with the VRF CUSTOMER keyword, causing the reachability check to fail in the global routing table. In an MPLS L3VPN environment, IP SLA traffic must be explicitly bound to the correct VRF using the `vrf` keyword under the `ip sla` configuration; otherwise, the probe uses the global table and cannot reach the target IP 10.10.10.10, which resides in the VRF. This explains why the track shows "Down" even though the static route appears in the VRF table—the route remains installed due to tracking delays or a stale entry, but the probe itself never succeeds. On the Cisco CCNP ENARSI 300-410 exam, this scenario tests your understanding of IP SLA VRF awareness in MPLS L3VPN deployments, a common trap where candidates overlook the VRF binding and assume the probe works globally. A quick memory tip: "If the target lives in a VRF, the SLA must wear the VRF tag."
300-410 IP SLA Practice Question
This 300-410 practice question tests your understanding of ip sla. 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 large enterprise uses IP SLA to track a route to a remote site via an MPLS L3VPN. Router R1 (PE) has:
ip sla 8
icmp-echo 10.10.10.10 source-ip 192.168.1.1 frequency 10
ip sla schedule 8 life forever start-time now track 8 ip sla 8 reachability ip route vrf CUSTOMER 10.10.10.0 255.255.255.0 192.168.1.2 track 8
The MPLS network is operational, but the route is intermittently removed. Show output on R1:
show ip route vrf CUSTOMER 10.10.10.0 Routing entry for 10.10.10.0/24 Known via "static", distance 1, metric 0 Last update from 192.168.1.2 on GigabitEthernet0/0
* 192.168.1.2, via GigabitEthernet0/0
But the track is down:
show track 8
Track 8 IP SLA 8 reachability
Reachability is Down 3 changes, last change 00:00:15
What is the root cause?
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 is not configured with the vrf CUSTOMER keyword, so the probe is sent in the global table and cannot reach the target in the VRF.
The IP SLA probe is sent to 10.10.10.10, but the source IP is 192.168.1.1. In an MPLS L3VPN, the VRF CUSTOMER might have a different routing table. The probe is sent in the global table unless configured with vrf. The correct answer is that the IP SLA is not VRF-aware, so the probe fails, but the static route is still installed because the track is down but the route is not removed immediately due to the delay or because the route is still in the table from a previous state.
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 is not configured with the vrf CUSTOMER keyword, so the probe is sent in the global table and cannot reach the target in the VRF.
Why this is correct
The IP SLA must be VRF-aware to send probes within the VRF; otherwise, the probe fails and the track goes down, but the route might still be installed due to other factors.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The MPLS label distribution is failing, causing the IP SLA probe to be dropped.
Why it's wrong here
The MPLS network is operational per the scenario.
- ✗
The source IP 192.168.1.1 is not in the VRF CUSTOMER, so the probe cannot be sourced correctly.
Why it's wrong here
The source IP can be in the global table; the issue is the probe is not sent in the VRF.
- ✗
The track 8 is not supported for VRF routes.
Why it's wrong here
Track with IP SLA is supported for VRF routes if configured correctly.
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.
Trap categories for this question
Scenario analysis trap
The MPLS network is operational per the scenario.
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 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
Got this wrong? Here's your next step.
Identify which 300-410 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.
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FAQ
Questions learners often ask
What does this 300-410 question test?
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: The IP SLA is not configured with the vrf CUSTOMER keyword, so the probe is sent in the global table and cannot reach the target in the VRF. — The IP SLA probe is sent to 10.10.10.10, but the source IP is 192.168.1.1. In an MPLS L3VPN, the VRF CUSTOMER might have a different routing table. The probe is sent in the global table unless configured with vrf. The correct answer is that the IP SLA is not VRF-aware, so the probe fails, but the static route is still installed because the track is down but the route is not removed immediately due to the delay or because the route is still in the table from a previous state.
What should I do if I get this 300-410 question wrong?
Identify which 300-410 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.
About these practice questions
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Last reviewed: Jun 19, 2026
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.
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