What term describes a network device to connect devices, operates on a physical layer level?

• A. Hub
• B. Switch
• C. Router
• D. Bridge

Answer: (A)

The key idea here is the layer at which a device operates. A hub is a physical-layer device that simply repeats electrical signals from any input port to all other ports. It doesn’t inspect or learn addresses, so it treats all traffic the same and doesn’t forward based on MAC or IP information. That pure reliance on the physical signal makes it a Layer 1 device that connects multiple devices together without performing any traffic segmentation.

In contrast, a switch or bridge works at the data-link layer by reading MAC addresses to forward frames to the correct destination, and a router works at the network layer using IP addresses to route packets between networks. So the description fits the hub best because it describes a device that connects devices but operates at the physical layer.