A single CSMA/CD network, consisting of an area in a network where data packets can collide. Collisions occur when two or more Ethernet stations are within the same collision domain and both transmit at the same time. Ethernet stations separated by a repeater are in the same collision domain, while stations separated by a bridge are in different collision domains. The concept of collision domain applies only to half-duplex Ethernet. Collisions do not occur in full-duplex Ethernet configurations.