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Difficulty: MediumCompTIA Troubleshooting Methodology

A network analyst suspects that an improper MTU size configuration on a newly deployed site-to-site IPsec VPN gateway is causing large HTTPS file transfers to fail. The analyst performs a ping sweep using unfragmented packets (14001400 bytes with the Don't Fragment flag set) and confirms that packets exceeding 13801380 bytes are dropped at the tunnel interface. Having verified the cause of the issue, which step should the analyst take next according to the CompTIA troubleshooting methodology?

  1. Develop a plan of action to adjust the interface MTU and TCP MSS settings while identifying potential side effects.Answer
  2. B
    Immediately modify the MTU size on the production router interface to restore full payload transmission.
  3. C
    Log the ping test results, exact byte limits, and root cause analysis in the IT ticketing system database.
  4. D
    Interview affected remote office workers to gather detailed logs on when the HTTPS timeout symptoms first started.

Answer

Develop a plan of action to adjust the interface MTU and TCP MSS settings while identifying potential side effects.
The correct response reflects Step 4 of the CompTIA troubleshooting methodology: 'Establish a plan of action to resolve the problem and identify potential side effects.' Because the analyst just finished testing and validating the theory (Step 3) via ping tests with the DF flag, the direct next requirement is to plan the resolution and evaluate potential side effects before executing changes.

Step-by-Step Solution

1
Identify the current step in the CompTIA troubleshooting methodology.
The technician tested the theory using unfragmented ping tests and confirmed the cause (Step 3: Test the theory to determine cause).
Determining the completed phase establishes where the analyst currently sits in the sequential methodology.
2
Determine the required next step in the standard 6-step CompTIA process.
Following Step 3 (Test theory), the next sequential step is Step 4: Establish a plan of action to resolve the problem and identify potential side effects.
Before making changes to production network equipment, a comprehensive plan and risk assessment must be established.

Key Concept

CompTIA Troubleshooting Methodology Step Order
Estimated Time:1m 15s
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Topics

CompTIA Troubleshooting Methodology

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