Page 829 - (ISC)² CISSP Certified Information Systems Security Professional Official Study Guide
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FIGURE 11.9 A ring topology
Bus Topology A bus topology connects each system to a trunk or
backbone cable. All systems on the bus can transmit data
simultaneously, which can result in collisions. A collision occurs when
two systems transmit data at the same time; the signals interfere with
each other. To avoid this, the systems employ a collision avoidance
mechanism that basically “listens” for any other currently occurring
traffic. If traffic is heard, the system waits a few moments and listens
again. If no traffic is heard, the system transmits its data. When data is
transmitted on a bus topology, all systems on the network hear the
