A bus topology has a multipoint connection. One long cable acts as a backbone to link all the devices in a network.

Nodes are connected to the bus cable by drop lines and taps. A drop line is a connection running between the device and the main cable. A tap is a connecter to the main cable that punctures the sheath of the cable to create a contact with the metallic core. As a signal travels along the backbone, some of its energy is transformed into heat. Therefore, it becomes weaker and weaker as it goes further. For this reason there is a limit, of number of taps a bus can support and on the distance between those taps.


  1. Easy to connect computer or peripheral to a linear bus.
  2. Requires less cable length than a star topology and mesh topology.
  3. It is very useful for smaller network and work very fast in smaller network.


  1. Entire network shuts down if there is a break in the main cable.
  2. Terminators are required at both ends of the backbone cable.
  3. Difficult to identify the problem if the entire network shuts down.
  4. Not meant to be used as a standalone solution
  5. Not suitable for networks with heavy traffic
  6. Maintenance cost gets higher with time
  7. Security is very low as it passes from one single cable.

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