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The Physical layer in data networks is responsible for the transmission and reception of raw bitstreams over a physical medium. It defines the hardware specifications, including cables, switches, and signals, ensuring that data can be effectively transmitted through various media like copper wires, fiber optics, or wireless channels. Additionally, it handles aspects such as modulation, signal strength, and timing to maintain reliable communication between devices. By establishing and maintaining the physical connection, the Physical layer enables higher layers of the network stack to function correctly.

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