MCQ Detailed View

The unit of data at the Physical Layer of the OSI model is called a bit. This is the smallest unit of data in networking and computing.

The Physical Layer is responsible for sending and receiving these bits as electrical signals, light pulses, or radio waves across the transmission medium like cables or wireless.

Key points about bits at the Physical Layer:

• A bit is a 0 or 1 — the most basic form of digital data


• It is transmitted as a signal over physical media


• This layer does not care about data structure — just raw transmission


• All higher-level data units (like frames or packets) are eventually converted into bits for transmission

So, the Physical Layer deals only with bits and how they are physically moved from one device to another.