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300-410 Practice Question: An engineer configures IP SLA with a UDP jitter…
An engineer configures IP SLA with a UDP jitter operation to monitor VoIP quality between two routers. The operation shows 'OverThreshold' in the show ip sla statistics output, but the engineer notices that the IP SLA responder on the remote router is configured with a control port that does not match the default. 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 IP SLA initiator must be configured with the 'control' keyword to specify the non-default control port on the responder.
IP SLA UDP jitter operations require the IP SLA responder to be configured with the correct control port; if the responder uses a non-default control port, the IP SLA initiator must be configured to use that port via the 'control' keyword under the IP SLA operation, otherwise the operation fails or produces incorrect results.
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 responder control port mismatch causes the operation to use a different port, but the jitter calculation is unaffected.
Why it's wrong here
The control port mismatch can lead to communication failure or incorrect statistics.
- ✓
The IP SLA initiator must be configured with the 'control' keyword to specify the non-default control port on the responder.
Why this is correct
When the responder uses a non-default control port, the initiator must match it using the control keyword; otherwise, the operation may fail or show anomalies.
- ✗
The IP SLA responder automatically adjusts its control port to match the initiator's request.
Why it's wrong here
The responder does not dynamically adjust; the ports must match.
- ✗
The UDP jitter operation does not use the control port; it only uses the destination port for jitter probes.
Why it's wrong here
The control port is used for setup and teardown of the jitter operation.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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