Multiple systems try to send data at the same time. The electrical impulses sent across the cable interfere with each other. What type of network segment is being used?

The correct answer is: Layer 1.

Explanation:

Layer 1 or physical layer is the basic layer of the Open System Interconnection (OSI) model that allows connecting data structures with higher network functions. Using a layer 1 network implies sending simultaneous binary data through electrical signals. Line coding, circuit switching or modulation are major services performed by this type of layer.