Which one is the most basic central connecting device hub switchrouter?

The most basic central connecting device among a hub, switch, and router is a hub. A hub operates at Layer 1 of the OSI model and simply connects multiple devices in a network, broadcasting data to all ports without filtering or directing traffic. This makes it less efficient compared to switches and routers, which manage data traffic more intelligently. However, hubs are simpler and less expensive than the other two devices.