In a network using a logical bus topology, messages travel by being broadcast to all devices connected to the network. When a device sends a message, the data is transmitted along a single shared communication line called the "bus." Every device on the bus receives the broadcasted message, but only the device whose address matches the destination address in the message processes it; all other devices ignore it
. Key points about message travel in logical bus topology:
- All devices share the same communication medium (the bus).
- Data is sent in one direction along the bus and is broadcast to all nodes.
- Each node checks the message's destination address and accepts the message only if it matches.
- The bus operates in half-duplex mode, meaning data can flow in both directions but only one device can transmit at a time to avoid collisions.
- If multiple devices transmit simultaneously, collisions occur, and devices must resend their messages after a jam signal is sent
Thus, messages are not sent point-to-point but broadcast over the bus, reaching all devices, with only the intended recipient acting on the message. This broadcast approach makes the logical bus topology simple and efficient for small networks but prone to congestion and collisions as more devices are added
