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Difficulty: MediumCompTIA Troubleshooting Methodology

A network technician is addressing severe voice quality degradation on an enterprise VoIP network following a core router firmware update. Place the technician's troubleshooting procedures in the correct sequence according to the official CompTIA troubleshooting methodology.

  1. 1Gather details from impacted users, review interface error counters, and replicate the choppy audio by placing test calls across the WAN.
  2. 2Hypothesize that the firmware update restored default interface settings and stripped the Low Latency Queueing (LLQ) Quality of Service (QoS) profile.
  3. 3Inspect the egress interface queue statistics to verify whether DSCP-marked voice packets are falling into the default best-effort queue.
  4. 4Formulate a change request to reconfigure the voice QoS policy on the WAN interface and assess potential impacts on routine data traffic.
  5. 5Place concurrent test calls while monitoring interface queue drops to confirm audio clarity and ensure non-voice traffic remains unaffected.
  6. 6Log the root cause, configuration changes, and update baseline router configuration records in the central documentation repository.

Answer

The correct sequence follows the official CompTIA troubleshooting methodology: 1. Identify the problem (gather information and replicate symptoms), 2. Establish a theory of probable cause (hypothesize QoS reset), 3. Test the theory (check queue statistics to confirm root cause), 4. Establish a plan of action (formulate change request and evaluate impact), 5. Verify full system functionality (place test calls to confirm resolution), 6. Document findings, actions, and outcomes (log the issue and update documentation).
The CompTIA troubleshooting methodology follows a strict 6-step lifecycle: 1) Identify the problem, 2) Establish a theory of probable cause, 3) Test the theory to determine the cause, 4) Establish a plan of action to resolve the problem and identify potential effects, 5) Verify full system functionality and, if applicable, implement preventive measures, and 6) Document findings, actions, and outcomes. The sequence correctly places problem identification and replication first, followed by hypothesis generation, theory testing, change planning, system verification, and final documentation.

Step-by-Step Solution

1
Identify the problem
Gathered user reports, checked error counters, and successfully replicated the voice degradation symptoms.
Troubleshooting must begin by defining the exact symptoms and establishing a clear problem scope.
2
Establish a theory of probable cause
Formulated a hypothesis that the recent firmware update removed the customized QoS configuration.
After gathering problem details, the technician considers potential causes, questioning the obvious factors like recent maintenance.
3
Test the theory to determine the cause
Confirmed that voice packets were incorrectly classified into the best-effort queue.
Testing validates whether the hypothesis is correct before taking disruptive corrective actions.
4
Establish a plan of action to resolve the problem and identify potential effects
Drafted a plan and change ticket to re-apply the LLQ QoS policy while evaluating potential network impact.
A structured plan ensures that changes are systematically planned, approved, and mitigated against unintended side effects.
5
Verify full system functionality and implement preventive measures
Confirmed clear voice calls and verified no dropouts or secondary issues occurred.
Fixes must be verified in the actual environment to ensure the problem is completely resolved without introducing new issues.
6
Document findings, actions, and outcomes
Recorded the issue summary, root cause, and updated baseline documentation.
Documenting creates historical references for future incidents and maintains accurate network records.

Key Concept

CompTIA 6-Step Network Troubleshooting Methodology
Estimated Time:1m 30s
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CompTIA Troubleshooting Methodology

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