CCNA 200-125 1.8: Apply troubleshooting methodologies to resolve problems

Understand troubleshooting methodologies and approaches to efficiently resolve network issues.

  • Troubleshooting methodology
    • Define the problem
    • Gather information
    • Analyze information
    • Eliminate potential causes
    • Propose hypothesis
    • Test hypothesis
    • Solve problem and document solution
  • Approach:
    • Top-down method: - start at the top of the OSI model
    • Bottom-up method: start at the bottom of the OSI model
    • Divide and conquer method: start in the middle of the OSI model
  • Methods:
    • Compare configuration to another similar device
    • Follow the path, checking each device in the path as you go
    • Swap components