hardMultiple ChoiceObjective-mapped
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 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?
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.
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.
- ✗
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.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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