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Difficulty: HardCompTIA Troubleshooting Methodology

During a post-maintenance outage, voice over IP (VoIP) endpoints on a newly provisioned voice VLAN fail to register with the local SIP call manager. A network engineer formulates a hypothesis that a newly applied transport layer security (TLS) certificate authority (CA) bundle is missing on the automated provisioning server payload. To test this theory, the engineer sets up an isolated test bench, captures the boot traffic of a test phone via switch port mirroring, and inspects the packet trace. The trace confirms that the phone aborts the session during the TLS handshake due to an untrusted certificate authority, successfully validating the root cause. Which of the following actions should the engineer perform NEXT according to the CompTIA troubleshooting methodology?

  1. Develop a plan of action to update the CA trust store on the provisioning server and assess potential side effects on active handsets before applying the change.Answer
  2. B
    Perform a complete registration check across subscriber phones on multiple subnets to confirm that voice services are operational.
  3. C
    Log the identified root cause, packet capture files, and final remediation steps into the enterprise change management system.
  4. D
    Interview administrative staff to determine if any network cable reconfigurations occurred during the maintenance window.

Answer

Develop a plan of action to update the CA trust store on the provisioning server and assess potential side effects on active handsets before applying the change.
In the CompTIA 7-step troubleshooting methodology, the steps are: 1. Identify the problem, 2. Establish a theory of probable cause, 3. Test the theory to determine cause, 4. Establish a plan of action to resolve the problem and identify potential effects (then implement the solution), 5. Verify full system functionality and implement preventive measures, and 6. Document findings, actions, and outcomes. Because packet capture analysis on the isolated test bench confirmed the root cause (untrusted CA certificate), Step 3 is complete. The required next step is Step 4: establishing a plan of action and evaluating potential side effects before implementing the resolution.

Step-by-Step Solution

1
Analyze current phase in CompTIA 7-step methodology
The engineer confirmed the hypothesis through packet inspection on an isolated test bench, completing Step 3 (Test the theory to determine cause).
Confirming the root cause concludes the theory testing phase.
2
Determine the next logical step in the CompTIA sequence
Step 4 of the methodology requires establishing a plan of action to resolve the problem and identifying potential effects.
Before executing changes in production, a plan must be structured and risk mitigation assessed.
3
Select the option that aligns with Step 4
Developing a plan of action to update the CA trust store while identifying potential impacts directly matches Step 4.
This maintains strict compliance with standard CompTIA troubleshooting framework rules.

Key Concept

CompTIA 7-Step Troubleshooting Methodology Sequence (Step 3 to Step 4 transition)
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Topics

CompTIA Troubleshooting Methodology

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