What is the first step in troubleshooting a network connectivity issue?

The first step in troubleshooting a network connectivity issue is to check the physical layer connections, including cables and connectors. This is crucial because many connectivity problems are often related to physical issues such as unplugged cables, damaged connectors, or faulty wiring. Ensuring that all physical connections are secure and functioning is fundamental because if the hardware is not correctly set up or has visible defects, it can prevent any data from being transmitted across the network.

Addressing the physical layer first allows a technician to rule out the most common causes of connectivity issues, which can save time and effort in the troubleshooting process. Checking these connections is a foundational troubleshooting step that precedes more complex diagnostics or software checks. If the physical layer connections are intact, the technician can then move on to more advanced testing, such as running diagnostics or updating drivers, but these steps assume that the basic physical infrastructure is operational.