The bus topology is constructed on a single cable, referred to as the bus, that each node on the network connects to. Each of these nodes passively listens for data being transmitted along the bus. If one node wants to transmit data to another node along the bus, it sends out a signal to the entire network, letting everyone know that a transmission is occurring. This transmission then travels down the bus, being ignored by all other nodes until it reaches its destination node and is accepted.
Copyright: Cybersecurity & Infrastructure Security Agency (CISA)