Which OSI layer deals with frames and translation from hardware to data, and where switches operate?

• A. Physical layer
• B. Data Link layer
• C. Network layer
• D. Presentation layer

Answer: (B)

Frames and MAC addressing live at the Data Link layer, which encapsulates raw bits from the Physical layer into frames and provides the addressing and error-detection needed to move data between devices on the same local network. This is also where switches operate: they read the MAC addresses in frames and forward them to the correct port to reach the destination within a local network. The Physical layer handles the actual signals, the Network layer handles routing and logical addressing, and the Presentation layer handles data formatting and encryption. So the Data Link layer is the layer that deals with frames, maps hardware identifiers to data paths, and is where switching occurs.