- A
The IP SLA operation has a frequency that is too low, causing a delay in detection of recovery.
Why wrong: Frequency affects how often probes are sent, but the delay is separate.
- B
The track object has a 'delay up' configured, causing a delay before the primary route is reinstalled.
The delay up command in the track object introduces a hold-down period before the object state changes to up, so the primary route is not reinstalled immediately.
- C
The backup static route has a lower administrative distance than the primary route.
Why wrong: The backup route should have a higher AD; otherwise, it would always be preferred.
- D
The IP SLA operation is still in the 'pending' state and has not yet recovered.
Why wrong: The operation shows success, so it has recovered.
Quick Answer
The answer is that the track object has a 'delay up' configured, which prevents the primary route from being reinstalled immediately after the IP SLA operation recovers. This delay is a purposeful mechanism within the IP SLA track object delay feature, designed to suppress route flapping by waiting for a specified period before declaring the tracked object as "up." When the IP SLA operation recovers, the track object transitions to an "up" state, but if a delay up is set, the static route tied to that track will not be reinstalled until that timer expires, leaving the backup route with a higher administrative distance in the routing table. On the Cisco CCNP ENARSI 300-410 exam, this scenario tests your understanding of how IP SLA tracking interacts with static route fallback behavior; a common trap is assuming route reinstallation is instantaneous upon SLA recovery. Remember the mnemonic "Delay Up, Route Stays Put" to recall that a configured delay up timer is the typical culprit when a primary route fails to return.
300-410 IP SLA Practice Question
This 300-410 practice question tests your understanding of ip sla. 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.
An engineer configures IP SLA with an ICMP echo operation and uses it to track a static default route. The engineer also configures a backup static route with a higher administrative distance. The IP SLA operation is configured with a timeout of 2000 ms and a frequency of 5 seconds. The engineer notices that when the primary route is removed due to IP SLA failure, the backup route is installed, but when the IP SLA operation recovers, the primary route is not reinstalled. The show ip route shows the backup route still present. Which is the most likely explanation?
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.
Clue:
"primary"Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
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 track object has a 'delay up' configured, causing a delay before the primary route is reinstalled.
When a tracked static route is removed, the backup route with higher AD is installed. When the IP SLA operation recovers, the track object goes up, and the primary route should be reinstalled. However, if the IP SLA operation recovers but the track object has a delay up configured, or if the primary route's AD is not lower than the backup route, the primary route may not be reinstalled. In this scenario, the most likely edge case is that the track object has a 'delay up' configured, which delays the route installation.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 has a frequency that is too low, causing a delay in detection of recovery.
Why it's wrong here
Frequency affects how often probes are sent, but the delay is separate.
- ✓
The track object has a 'delay up' configured, causing a delay before the primary route is reinstalled.
Why this is correct
The delay up command in the track object introduces a hold-down period before the object state changes to up, so the primary route is not reinstalled immediately.
Clue confirmation
The clue words "most likely", "primary" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
The backup static route has a lower administrative distance than the primary route.
Why it's wrong here
The backup route should have a higher AD; otherwise, it would always be preferred.
- ✗
The IP SLA operation is still in the 'pending' state and has not yet recovered.
Why it's wrong here
The operation shows success, so it has recovered.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Trap categories for this question
Command / output trap
The operation shows success, so it has recovered.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 300-410 NAT questions on configuration and troubleshooting.
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FAQ
Questions learners often ask
What does this 300-410 question test?
IP SLA — This question tests IP SLA — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The track object has a 'delay up' configured, causing a delay before the primary route is reinstalled. — When a tracked static route is removed, the backup route with higher AD is installed. When the IP SLA operation recovers, the track object goes up, and the primary route should be reinstalled. However, if the IP SLA operation recovers but the track object has a delay up configured, or if the primary route's AD is not lower than the backup route, the primary route may not be reinstalled. In this scenario, the most likely edge case is that the track object has a 'delay up' configured, which delays the route installation.
What should I do if I get this 300-410 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 300-410 NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "most likely", "primary". 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?
Static NAT maps one inside address to one outside address.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
2 more ways this is tested on 300-410
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. An engineer configured IP SLA 80 to monitor a remote server (192.168.100.100) using ICMP echo. The IP SLA is used in a track object for a static route. The engineer notices that the IP SLA state is 'Active', but the track object shows 'Down'. What is the most likely cause?
hard- ✓ A.The track object is configured with a 'delay up' timer that has not yet expired.
- B.The IP SLA probe is using a different source IP than expected.
- C.The track object is referencing the wrong IP SLA number.
- D.The router's routing table is full, preventing the track object from updating.
Why A: The track object can be configured with a threshold (e.g., 'threshold' or 'delay') that causes it to remain 'Down' even if the IP SLA is 'Active'. For example, if the track object has a 'delay up' timer, it will not transition to 'Up' immediately.
Variation 2. An engineer configures IP SLA with an ICMP echo operation and tracks it with a static route. The IP SLA operation is configured with a source interface of Loopback0. The engineer notices that when the remote host becomes unreachable, the static route is removed, but when the remote host becomes reachable again, the static route is not reinstalled immediately. The show ip sla statistics shows the operation is 'Active' and 'Success'. Which is the most likely explanation?
hard- A.The static route has a higher administrative distance than the default route, so it is not installed.
- ✓ B.The track object has a 'delay up' configured, causing a delay before the route is reinstalled.
- C.The IP SLA operation uses a source interface that is not reachable from the remote host, causing asymmetric routing.
- D.The IP SLA operation has a frequency that is too high, causing the router to ignore the results.
Why B: When an IP SLA operation uses a source interface, the operation may fail if that interface is down, but more importantly, the track object may have a delay configured for up transitions. Additionally, the static route may have a higher administrative distance that prevents it from being reinstalled if another route to the same prefix exists. However, the most common edge case is that the track object has a 'delay up' configured, which delays the route installation after the operation recovers.
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Last reviewed: Jun 19, 2026
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