Question 1,650 of 2,152

IP SLA →hardMultiple ChoiceObjective-mapped

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 route. The engineer also configures a backup static route with a higher administrative distance. 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 sla statistics shows the operation is 'Active' and 'Success'. The show track shows the track object is 'Up'. 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.

Question 1hardmultiple choice

Read the full NAT/PAT explanation →

A
The primary static route has a higher administrative distance than the backup route.
If the primary route has a higher AD, it will not be installed even when the track object is up, because the backup route is preferred.
B
The IP SLA operation has a frequency that is too low, causing a delay in detection of recovery.
Why wrong: The track object is up, so recovery is detected.
C
The track object has a 'delay up' configured, causing a delay before the primary route is reinstalled.
Why wrong: The track object is already up, so delay is not the issue.
D
The backup static route is configured with a permanent keyword, preventing the primary route from being reinstalled.
Why wrong: The permanent keyword prevents the route from being removed, but it does not prevent a better route from being installed.

Full breakdown with real-world context →

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 primary static route has a higher administrative distance than the backup route.

When a tracked static route is removed and the backup route is installed, the primary route may not be reinstalled if the primary route's administrative distance is not lower than the backup route. However, in this scenario, the track object is up, so the primary route should be reinstalled. The most likely edge case is that the primary static route has a higher administrative distance than the backup route, which would prevent it from being reinstalled even when the track object is up. This can happen if the engineer misconfigured the AD values.

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 primary static route has a higher administrative distance than the backup route.
Why this is correct
If the primary route has a higher AD, it will not be installed even when the track object is up, because the backup route is preferred.
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 IP SLA operation has a frequency that is too low, causing a delay in detection of recovery.
Why it's wrong here
The track object is up, so recovery is detected.
✗
The track object has a 'delay up' configured, causing a delay before the primary route is reinstalled.
Why it's wrong here
The track object is already up, so delay is not the issue.
✗
The backup static route is configured with a permanent keyword, preventing the primary route from being reinstalled.
Why it's wrong here
The permanent keyword prevents the route from being removed, but it does not prevent a better route from being installed.

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

Keyword trap
The permanent keyword prevents the route from being removed, but it does not prevent a better route from being installed.

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 primary static route has a higher administrative distance than the backup route. — When a tracked static route is removed and the backup route is installed, the primary route may not be reinstalled if the primary route's administrative distance is not lower than the backup route. However, in this scenario, the track object is up, so the primary route should be reinstalled. The most likely edge case is that the primary static route has a higher administrative distance than the backup route, which would prevent it from being reinstalled even when the track object is up. This can happen if the engineer misconfigured the AD values.

What should I do if I get this 300-410 question wrong?

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.

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