A bus topology connects each computer (node) to a single segment trunk (a communication line, typically coax cable) known as the 'bus.' The signal crosses the bus from one end to the other. Each requires a terminator to absorb the signal so that it does not reflect back across the bus. To handle collisions that occur when two signals are placed on the wire at the same time, a media access method known as CSMA/MA is used. The topology of the bus is passive. In other words, the computers on the bus simply 'listen' for a signal; they are not in charge of moving it.

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