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Difficulty: MediumTroubleshooting Methodology

A network technician is investigating a report where a newly installed VoIP desk phone continuously reboots whenever it is plugged into a managed switch port with Power over Ethernet (PoE) enabled. Arrange the technician's actions in the correct chronological order according to the CompTIA 6-step troubleshooting methodology, starting with the initial step at the top.

  1. 1Interview the user regarding when the rebooting began and review the switch log files for port-level power budget errors.
  2. 2Hypothesize that the switch port's PoE power allocation profile is set to a lower wattage class than required by the phone.
  3. 3Connect the VoIP phone to a standalone PoE power injector to verify if insufficient switch port wattage is causing the reboot loop.
  4. 4Reconfigure the switch port power profile to supply the full IEEE 802.3at wattage class demanded by the VoIP phone.
  5. 5Verify that the phone completes its boot sequence and places a test call, then update the switch documentation and ticket history.

Answer

The correct sequence follows the standard CompTIA troubleshooting framework: 1) Interview the user and check switch logs to identify the problem, 2) Formulate a theory regarding incorrect PoE power allocation, 3) Test the theory using a standalone PoE injector, 4) Reconfigure the switch port power profile to implement the solution, and 5) Verify full functionality with a test call and document the findings.
The correct order strictly follows the standard CompTIA 6-step troubleshooting methodology: first gather information and check logs to identify symptoms, second establish a theory of cause regarding PoE power limits, third test that theory using an external power source, fourth implement the switch port re-configuration, and finally verify phone operation while documenting the resolution.

Step-by-Step Solution

1
Identify the problem
Information gathered from user interview and switch log files detailing power errors.
Troubleshooting must begin with gathering symptom details and questioning users.
2
Establish a theory of probable cause
Formulated hypothesis that power class allocation on the switch port is insufficient.
After understanding symptoms, the technician questions the obvious and establishes a cause theory.
3
Test the theory to determine cause
Connecting the phone to an external PoE injector stabilizes the phone, confirming the theory.
The theory must be confirmed via diagnostic testing before permanent configuration changes are applied.
4
Establish a plan of action and implement the solution
Switch port configuration is modified to allocate adequate wattage class.
Once the cause is proven, the technician plans and carries out the permanent fix.
5
Verify full functionality and document findings
Test call successful; root cause and configuration changes documented in the system.
Ensures the system is fully operational and records knowledge for future incident reference.

Key Concept

CompTIA 6-Step Troubleshooting Methodology
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Topics

Troubleshooting Methodology

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