TOP-DOWNBOTTOM-UP TROUBLESHOOTING

TOP-DOWN/BOTTOM-UP TROUBLESHOOTING

7. Top-down ” Troubleshooting starts with the upper layers of the OSI Reference Model, such as verifying that certain applications are functioning.

8. Bottom-up ” Troubleshooting starts with the lower layers of the OSI Reference model, such as checking an IP address or the CRC errors on a physical interface.