Which OSI layer is responsible for the physical connections of the devices in the network (hubs, repeaters, modems, cabling)?

Which OSI layer is responsible for the physical connections of the devices in the network (hubs, repeaters, modems, cabling)?

• A. Physical Layer
• B. Data Link Layer
• C. Network Layer
• D. Application Layer

Answer: (A)

Transmitting raw bits over a physical medium is the job of the Physical layer. It defines how electrical or optical signals are sent, including the signaling method, timing, connectors, and cabling standards that make a network physically possible. Devices like hubs and repeaters operate at this layer because they don’t interpret data; they simply amplify or forward signals to extend the reach of the network. Modems also function at this layer, converting between digital signals and the analog or other physical forms used on the transmission medium. The cabling itself is part of what the Physical layer specifies, providing the actual path for signals to travel. In contrast, the Data Link layer handles frames and MAC addressing on a local link, the Network layer handles routing between networks, and the Application layer deals with user-facing services. So, the responsibility described here aligns with the Physical layer.

Transmitting raw bits over a physical medium is the job of the Physical layer. It defines how electrical or optical signals are sent, including the signaling method, timing, connectors, and cabling standards that make a network physically possible. Devices like hubs and repeaters operate at this layer because they don’t interpret data; they simply amplify or forward signals to extend the reach of the network. Modems also function at this layer, converting between digital signals and the analog or other physical forms used on the transmission medium. The cabling itself is part of what the Physical layer specifies, providing the actual path for signals to travel. In contrast, the Data Link layer handles frames and MAC addressing on a local link, the Network layer handles routing between networks, and the Application layer deals with user-facing services. So, the responsibility described here aligns with the Physical layer.