Which layer of OSI is concerned with voltage levels, timing, and cable types?

This layer defines how devices are physically connected and how bits are transmitted over those connections. It deals with the hardware details that allow digital data to travel from one point to another.

Key responsibilities of the Physical Layer:

• Defines voltage levels used for signaling


• Manages signal timing and synchronization


• Specifies types of cables, connectors, and pin layouts


• Handles data in the form of raw bits

Interview Tip: If you are asked about anything related to cables, hardware signals, or how data is physically sent, the answer usually relates to the Physical Layer.

Conclusion: The Physical Layer focuses on the physical connection between devices, including voltage, timing, and cable types, making it a key part of real-world network setups.