hardMultiple ChoiceObjective-mapped
300-410 Practice Question: Configures IP SLA with a UDP echo operation to…
A network engineer configures IP SLA with a UDP echo operation to monitor a remote server. The IP SLA responder is configured on the remote router. The engineer notices that the operation shows 'Timeout' intermittently, but standard UDP connectivity tests from the router to the server succeed. The engineer checks the IP SLA responder configuration and finds that the control port is set to a non-default value. 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 match the non-default control port on the responder.
IP SLA UDP echo operations require the IP SLA responder to be configured with the correct control port. If the responder uses a non-default control port, the initiator must be configured to use that port using the 'control' keyword under the IP SLA operation. Without this, the initiator uses the default control port (1967), causing communication failures and intermittent timeouts.
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 is not configured to respond to UDP echo requests from the initiator.
Why it's wrong here
The responder is configured, but the control port mismatch prevents proper setup.
- ✓
The IP SLA initiator must be configured with the 'control' keyword to match the non-default control port on the responder.
Why this is correct
The control port mismatch causes the initiator to fail to establish the operation, leading to timeouts.
- ✗
The UDP echo operation uses a different protocol than standard UDP, causing packet drops.
Why it's wrong here
UDP echo uses standard UDP; the issue is control port.
- ✗
The IP SLA operation has a threshold that is too low, causing the operation to time out.
Why it's wrong here
Threshold does not cause timeouts; timeout does.
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Same concept, more angles
1 more way this is tested on 300-410
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. 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?
hard- A.The IP SLA responder control port mismatch causes the operation to use a different port, but the jitter calculation is unaffected.
- ✓ B.The IP SLA initiator must be configured with the 'control' keyword to specify the non-default control port on the responder.
- C.The IP SLA responder automatically adjusts its control port to match the initiator's request.
- D.The UDP jitter operation does not use the control port; it only uses the destination port for jitter probes.
Why B: 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.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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