Examkin

Question

Difficulty: Very hardCompTIA Troubleshooting Methodology

A network engineer is responding to reports of intermittent application session resets occurring across a hybrid cloud IPsec tunnel following a recent router firmware patch. Place the technician's troubleshooting procedures in the precise order required by the official CompTIA troubleshooting methodology, from the initial action to the final action.

  1. 1Review router interface logs, query affected database users to determine when session resets occur, and replicate the failure using synthetic traffic benchmarks.
  2. 2Evaluate packet header overhead and hypothesize that DF (Don't Fragment) bit enforcement combined with MTU mismatch is causing TCP packet drops.
  3. 3Execute ping sweeps with varying payload sizes and the DF bit set to verify if packet fragmentation requests fail across the IPsec tunnel.
  4. 4Submit a change control ticket detailing an MSS clamping configuration update, assess potential bandwidth impacts, and apply the MSS value to the tunnel interface.
  5. 5Monitor real-time database transactions for dropped frames, confirm uninhibited payload transfer, and adjust interface MTU monitoring thresholds in the NMS.
  6. 6Log the root cause analysis, modified MSS values, and updated IPsec tunnel baseline configuration in the corporate ticketing system.

Answer

The correct sequential order of the troubleshooting process is: 1. Review logs, interview users, and duplicate the failure; 2. Formulate a hypothesis regarding DF bit enforcement and MTU mismatch; 3. Perform ping tests with the DF bit set to test the hypothesis; 4. Submit change management details, identify potential impacts, and apply MSS clamping; 5. Verify transaction stability under full system load and configure monitoring thresholds; 6. Log findings, parameters, and documentation in the ticketing system repository.
The correct sequence strictly adheres to the official CompTIA 6-step troubleshooting workflow: (1) Identify the problem by gathering symptoms and duplicating the issue; (2) Establish a theory of probable cause by analyzing header overhead and packet constraints; (3) Test the theory using DF bit ping sweeps; (4) Formulate a change management plan of action, evaluate side effects, and implement MSS clamping; (5) Verify full functionality under real workloads and apply preventive monitoring; (6) Document the root cause and configuration details in the enterprise repository.

Step-by-Step Solution

1
Identify the problem by interviewing users, reviewing error logs, and replicating the issue.
Establishes clear symptoms, baseline conditions, and scope of the failure.
CompTIA methodology strictly mandates gathering information and establishing symptoms before making assumptions or forming hypotheses.
2
Establish a theory of probable cause by evaluating physical, transport, and network layer parameters.
Develops a plausible hypothesis (MTU/DF bit mismatch across IPsec tunnel).
A theory must be established before conducting targeted diagnostic tests.
3
Test the theory using diagnostic utilities (ping with DF bit set).
Confirms or denies the root cause of the problem.
Testing validates the theory without prematurely implementing untested production modifications.
4
Establish a plan of action to resolve the issue, evaluate potential side effects, and implement the solution.
Applies the resolution (MSS clamping configuration) safely through change control procedures.
Remediation planning and impact analysis must precede implementation to prevent unintended outages.
5
Verify full system functionality and implement preventive measures.
Ensures the system operates correctly end-to-end and guards against future recurrence.
Confirmation of overall system health must occur before final sign-off and ticket closure.
6
Document findings, actions, and outcomes.
Updates organizational knowledge bases and incident history records.
Documentation provides reference material for future network incidents and completes the methodology.

Key Concept

CompTIA 6-Step Network Troubleshooting Methodology Sequential Flow
Rate this question

Topics

CompTIA Troubleshooting Methodology

More questions from this topic