In a simple Ethernet bus network the cable is terminated at both ends. Ethernet is a baseband architecture that uses a bus topology. It usually transmits at 10 Mbps and relies on CSMA/CD to regulate traffic on the main cable segment. The Ethernet media is passive, which means it requires no power source of its own. Because of this it will not fail unless the media is physically cut or improperly terminated.
Note: the topology of star bus means that it is physically a star and logically a bus.