* Introduction to Troubleshooting Methodology:
* Network troubleshooting involves a systematic approach to identifying and resolving network issues. The CompTIA Network+ certification emphasizes a structured troubleshooting methodology.
* Troubleshooting Steps:
* Identify the problem: Gather information, identify symptoms, and question users.
* Establish a theory of probable cause: Consider possible reasons for the issue.
* Test the theory to determine cause: Validate the theory with tests.
* Establish a plan of action to resolve the problem and implement the solution: Create and execute a resolution plan.
* Verify functionality and implement preventive measures: Ensure the solution works and prevent recurrence.
* Verifying Functionality:
* After implementing a solution, verifying functionality ensures that the problem is fully resolved.
This involves testing the network to confirm that it operates correctly.
* Checking through each level of the OSI model helps to ensure that all potential issues at different layers (physical, data link, network, transport, session, presentation, and application) are addressed.
* Explanation of the Options:
* A. Establish a theory: This step involves hypothesizing possible causes, not verifying functionality.
* B. Implement the solution: This step involves executing the resolution plan.
* C. Create a plan of action: This step involves planning the resolution, not verification.
* D. Verify functionality: This step involves comprehensive checks, including OSI model layers, to ensure the issue is fully resolved.
* Conclusion:
* Verifying functionality is a critical step in the troubleshooting process, ensuring that the network operates correctly after a solution is implemented. It involves thorough testing across all OSI model layers.
References:
* CompTIA Network+ guide explaining the troubleshooting methodology and the importance of verifying functionality (see page Ref 9†Basic Configuration Commands).