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Difficulty: MediumCompTIA Troubleshooting Methodology

A network technician is investigating intermittent connectivity and framing errors on a trunk link between two distribution switches. The technician has established a theory that a native VLAN mismatch is causing untagged traffic to drop and has confirmed this cause by inspecting packet captures on both switch interfaces. According to the CompTIA troubleshooting methodology, which of the following actions should the technician take NEXT?

  1. Establish a plan of action to align the native VLAN configurations across the trunk link and identify potential side effects.Answer
  2. B
    Verify full system functionality by performing end-to-end ping tests and implement automated configuration compliance alerts.
  3. C
    Document the diagnostic packet captures, identified root cause, and complete change history in the centralized ticketing system.
  4. D
    Interview affected users across connected VLANs to gather additional symptoms and establish duplicate issue reports.

Answer

Establish a plan of action to align the native VLAN configurations across the trunk link and identify potential side effects.
The technician has completed Step 3 of the CompTIA troubleshooting methodology by testing the theory and confirming that a native VLAN mismatch is the root cause. The next step (Step 4) requires establishing a plan of action to resolve the issue while identifying potential side effects before implementing the solution.

Step-by-Step Solution

1
Determine the current stage of the troubleshooting process from the scenario stem.
The technician has established a theory and tested it via packet captures to confirm the root cause, satisfying Step 3 (Test the theory to determine cause).
Identifying the completed step is necessary to accurately select the next logical phase.
2
Map the next phase in the official CompTIA 6-step troubleshooting methodology.
Step 1: Identify problem → Step 2: Establish theory → Step 3: Test theory → Step 4: Establish plan of action & identify potential effects → Step 5: Verify full system functionality & preventive measures → Step 6: Document findings.
CompTIA standards require strictly following sequential methodology.
3
Select the correct action corresponding to Step 4.
Formulating a plan of action to change the native VLAN settings while considering potential network disruptions represents Step 4.
A plan of action ensures that changes are systematically planned and risks are identified before implementation.

Key Concept

CompTIA Troubleshooting Methodology Sequence
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Topics

CompTIA Troubleshooting Methodology

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