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 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?
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 route is reinstalled.
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.
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 static route has a higher administrative distance than the default route, so it is not installed.
Why it's wrong here
The static route is the only route; AD is not the issue.
- ✓
The track object has a 'delay up' configured, causing a delay before the route is reinstalled.
Why this is correct
The `track object delay up` command introduces a timer that postpones the transition of the tracked object from 'Down' to 'Up' state, even after the IP SLA operation reports 'Success' and 'Active'. This directly explains why the static route, which depends on the track object being 'Up', is not reinstalled immediately when the remote host becomes reachable again. The constraint satisfied is the observed delay between the host's recovery and the route's reinstallation.
- ✗
The IP SLA operation uses a source interface that is not reachable from the remote host, causing asymmetric routing.
Why it's wrong here
The operation shows success, so reachability is not the issue.
- ✗
The IP SLA operation has a frequency that is too high, causing the router to ignore the results.
Why it's wrong here
Frequency does not cause ignored results.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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