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300-410 Practice Question: An engineer configures IP SLA with an ICMP echo…
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?
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.
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.
- ✗
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.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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