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Difficulty: MediumCompTIA Troubleshooting Methodology

A network administrator has just completed testing a theory and confirmed that an incorrect Maximum Transmission Unit (MTU) setting on an edge router interface is causing packet fragmentation and dropping encrypted site-to-site IPsec VPN traffic. Following the CompTIA troubleshooting methodology, the administrator is now preparing to transition to the phase of establishing a plan of action and implementing the solution. Which of the following specific tasks should be performed during this phase? (Select TWO.)

  1. Assess potential side effects and impacts on downstream network services before applying configuration modifications.Answer
  2. Draft a step-by-step implementation procedure alongside a roll-back contingency plan in case issues arise during execution.Answer
  3. C
    Execute ICMP ping sweeps with maximum-payload packets across the tunnel to confirm that packet fragmentation is resolved.
  4. D
    Log the root cause analysis, interface configuration changes, and final resolution details in the central ticketing platform.

Answer

The technician must assess potential side effects on downstream network services and draft a detailed step-by-step implementation plan with rollback contingency steps.
According to the CompTIA troubleshooting methodology, after a theory is confirmed in Step 3, the technician proceeds to Step 4: 'Establish a plan of action to resolve the problem and implement the solution.' This step explicitly requires identifying potential effects on existing systems, designing a clear step-by-step implementation procedure, and formulating a rollback contingency plan.

Step-by-Step Solution

1
Identify current phase in CompTIA Troubleshooting Methodology
The technician has confirmed the theory (Step 3 complete) and is entering Step 4: Establish a plan of action to resolve the problem and implement the solution.
Once a theory of probable cause is verified, the technician moves to planning and implementation.
2
Differentiate tasks belonging strictly to Step 4 from subsequent steps
Step 4 encompasses identifying potential side effects, creating an action plan, writing rollback procedures, and executing the solution.
Proper change management requires risk analysis and rollback plans before implementation.
3
Select valid Step 4 actions
Assessing impact on downstream services and creating step-by-step rollout and fallback procedures belong in Step 4.
System testing (Step 5) and documentation logging (Step 6) occur later in the troubleshooting process.

Key Concept

CompTIA Troubleshooting Methodology - Plan of Action & Implementation
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CompTIA Troubleshooting Methodology

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