Chapter 9 Troubleshooting Notebook

Chapter 9 Troubleshooting Notebook - Chapter 9 T...

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Unformatted text preview: Chapter 9 T roubleshooting Notebook 1 BY: Jourdan Fletcher I ndex Contents 2 OSI Model Figure 1-1 Used to troubleshooting network programs Top-down 3 o Troubleshooting starting with the application layer o Useful for solving application specific problems o Used by more experienced technicians Bottom- UP o A troubleshooting approach starting with the physical layer o Useful for solving connectivity problems o Used mainly by inexperienced technicians Divide- and Conquer o Approach specifically designed to resolve a network issue o Breaks down problem into smaller parts o Usually solves Routing issues, excessive broadcasts, NAT/PAT issue Trial and Error o Relies on experience and testing to solve a problem Substitution o Technique that uses functioning parts to test equipment 4 T roubleshooting Switching Figure 1-2 Trouble Shooting Connectivity o Ensure that the power LED is illuminated. (fig 1-2) o Ensure that the correct type of cable connects the end device to the switch. o Reseat the cables at both the workstation and the switch end. o Check the configuration to ensure that the port is in a no shutdown state. Indicators of Loops 5 o Loss of connectivity to, from, and through affected network regions o High CPU utilization on routers connected to affected segments o High link utilization up to 100% o High switch backplane utilization as compared to the baseline utilization...
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Chapter 9 Troubleshooting Notebook - Chapter 9 T...

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