A communications engineer notices that every time it rains the signal becomes very degraded. Which layer of the OSI model is the engineer most likely troubleshooting? Application Physical Transport Data Link

The engineer is most likely troubleshooting the Physical layer of the OSI model. The Physical layer is responsible for transmitting raw data bits over a physical transmission medium. It deals with the physical characteristics of the transmission medium, such as electrical, mechanical, and physical properties. When it rains, the signal can become degraded due to interference or noise in the transmission medium, which can affect the Physical layer.