CompTIA Cloud+ Practice Test 2025 - Free CompTIA Cloud+ Practice Questions and Study Guide

The bottom-up troubleshooting approach is focused on starting the diagnostic process at the lowest level of the network hierarchy, which includes physical devices like switches, routers, and the physical connections between them. This method operates on the premise that many issues originate from foundational layers, such as cabling or hardware failures, making it logical to begin troubleshooting from the base level.

By examining the physical elements first, technicians can quickly identify and address problems related to connectivity that may affect higher layers. If the lower layers are functioning properly, the troubleshooting process can then move up through the layers of the OSI model to investigate software configurations, applications, and user-level issues systematically.

This approach contrasts with others that may start from the top layer, assuming the higher-level applications or software are the culprits without first confirming the integrity of the physical infrastructure. Thus, utilizing the bottom-up method helps technicians avoid missing basic issues that could cause more complex problems later in the troubleshooting process.