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Difficulty: MediumCompTIA Troubleshooting Methodology

A network engineer is responding to a critical datastore access failure across a virtualized server cluster immediately following scheduled network switch maintenance. Place the following troubleshooting steps in the correct chronological sequence according to the official CompTIA troubleshooting methodology.

  1. 1Gather hypervisor storage event logs and interview host administrators regarding the specific symptoms observed during maintenance.
  2. 2Hypothesize that the dedicated iSCSI traffic VLAN was inadvertently omitted from the switch trunk port configuration.
  3. 3Inspect the running configuration of the storage switch to verify whether the iSCSI VLAN ID is active on the trunk link.
  4. 4Formulate a change plan to re-add the missing iSCSI VLAN to the trunk port profile and apply the configuration fix.
  5. 5Run storage I/O performance tests across all hypervisor nodes to confirm datastore access and configure automated switch configuration logging.
  6. 6Log the root cause, configuration fix, and updated maintenance checklist in the IT service management system.

Answer

The correct sequence follows the official 6-step CompTIA Troubleshooting Methodology: 1. Identify the problem (gather hypervisor logs and interview admins) -> 2. Establish a theory of probable cause (hypothesize missing iSCSI VLAN) -> 3. Test the theory to determine cause (inspect switch running configuration) -> 4. Establish a plan of action and implement the solution (formulate change plan and apply fix) -> 5. Verify full system functionality and implement preventive measures (run I/O performance tests and configure logging) -> 6. Document findings, actions, and outcomes (log incident root cause and resolution in ticketing system).
The correct order strictly adheres to the standard 6-step CompTIA troubleshooting methodology: 1. Identify problem -> 2. Establish theory -> 3. Test theory -> 4. Plan of action & implement -> 5. Verify system functionality & preventive measures -> 6. Document findings.

Step-by-Step Solution

1
Identify the problem
Information is gathered from logs and host administrators to define the scope of the storage failure.
CompTIA methodology requires gathering information and identifying symptoms before forming assumptions.
2
Establish a theory of probable cause
A working theory is developed pointing to a missing iSCSI VLAN on the switch trunk port.
After defining symptoms, the technician considers potential causes, starting with the most probable.
3
Test the theory to determine the cause
The running configuration is checked to confirm if the iSCSI VLAN was dropped from the trunk.
The theory must be verified prior to making changes to the production network.
4
Establish a plan of action and implement the solution
A change plan is drafted and executed to restore the iSCSI VLAN to the trunk link.
Once the cause is confirmed, a plan of action is created to resolve the issue while minimizing risk.
5
Verify full system functionality and implement preventive measures
Datastore I/O benchmarks confirm storage recovery, and configuration logging is added to prevent future drops.
The solution must be validated across the entire system, followed by preventive steps against recurrence.
6
Document findings, actions, and outcomes
The ticketing system is updated with root cause details and updated procedure notes.
The final stage of the methodology requires documenting all steps for future reference and team knowledge.

Key Concept

CompTIA 6-Step Network Troubleshooting Methodology
Estimated Time:2m 0s
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Topics

CompTIA Troubleshooting Methodology

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