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Network Topologies: Bus This lesson covers bus topology. In bus topology, all of the nodes are connected to a single cable. This is very common in set ups when there is a T axle on each node as well as in 10-base-5 networks. In bus topology, all signals are sent using broadcast. An advantage of bus topology is that it has the least cost and set up; it is also good for small networks A disadvantage of bus topology is that it has limited length and if one node goes down, everything goes down.