The network troubleshooting methodology is a systematic process of identifying and resolving network problems. It consists of eight steps:
1. Identify the problem.
2. Establish a theory of probable cause.
3. Test the theory to determine the cause.
4. Establish a plan of action to resolve the problem and identify potential effects.
5. Implement the solution or escalate as necessary.
6. Verify full system functionality and, if applicable, implement preventive measures.
7. Document findings, actions, and outcomes.
8. Write the lessons learned.
The last step, writing the lessons learned, is important for improving the network troubleshooting skills and knowledge. It involves reviewing the entire troubleshooting process, analyzing the root cause of the problem, evaluating the effectiveness of the solution, and identifying any best practices, tips, or tools that can be used for future reference. Writing the lessons learned can also help to update the network documentation, policies, and procedures, and share the experience and feedback with other network professionals