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Difficulty: HardCompTIA Troubleshooting Methodology

A network engineer is investigating intermittent packet loss and database session drops across a newly provisioned IPsec VPN tunnel between two enterprise data centers. After analyzing interface counters and running test ping sweeps with custom payload sizes, the engineer successfully proves that an MTU mismatch is causing packet fragmentation errors and confirms that lowering the tunnel interface MTU in a staging sandbox completely eliminates the drop count. According to the CompTIA troubleshooting methodology, which action should the engineer perform NEXT?

  1. Formulate a formal plan of action to modify the production MTU settings while identifying any potential side effects or service disruptions.Answer
  2. B
    Perform comprehensive end-to-end verification testing across all active database applications and host systems across the VPN tunnel.
  3. C
    Log the root cause analysis, change details, and resolution outcome into the enterprise knowledge base and ticketing system.
  4. D
    Re-interview network users and gather additional syslog data to determine whether physical layer cabling issues might also be contributing to the drops.

Answer

Formulate a formal plan of action to modify the production MTU settings while identifying any potential side effects or service disruptions.
The scenario indicates that Step 3 of the CompTIA troubleshooting methodology (Test the theory to determine cause) has just been successfully completed. According to the official methodology, the immediate next action is Step 4: Establish a plan of action to resolve the problem and identify potential effects, followed by implementing the solution. Planning out the deployment in production ensures changes do not cause unintended outages.

Step-by-Step Solution

1
Determine current step in the troubleshooting process.
The scenario describes a technician who tested a hypothesis in a lab setting and confirmed the root cause (MTU mismatch). This completes Step 3 (Test the theory to determine cause).
CompTIA methodology relies on a strict sequential workflow.
2
Identify the mandatory next step in the CompTIA 6-step process.
Step 4 is 'Establish a plan of action to resolve the problem and identify potential effects; implement the solution or escalate as necessary.'
Before making production changes, a technician must plan the deployment and evaluate potential downtime or collateral impact.
3
Evaluate the choices against Step 4.
The option advocating the formulation of a plan of action and assessment of side effects directly matches Step 4.
Other options jump ahead to Step 5 (verification), Step 6 (documentation), or regress to Step 1 (identification).

Key Concept

CompTIA Troubleshooting Methodology Step Sequence
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Topics

CompTIA Troubleshooting Methodology

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