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What is the correct troubleshooting order suggested by the OSI model?

  1. A Work upward from physical connectivity through IP, DNS and then the application
  2. B Start at the application layer
  3. C Start with DNS always
  4. D Check layers in random order
Answer

Work upward from physical connectivity through IP, DNS and then the application

Jumping to a complex explanation before checking whether the cable is plugged in is the mistake the model prevents.

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