Back in the day for Layer1, there were 10Base-2 (Thinnet) and 10BaseT (Thicknet). These types of layer one technologies used coaxial cable on shared bus systems. Really - just to repeat the layer one

Even though today repeaters and hubs are essentially same devices, it was not always this way. As it is clear from the name, main goal of repeater is to "repeat". Due to nature of electrical current,

The choice between hubs and switches is pretty easy, we’ll show why. When designing and building a network, even a home network

What is the difference between an Ethernet hub and switch?       Although hubs and switches both glue the PCs in a network together, a switch is more expensive and a network