Figure 41 Mesh Star Ring and Bus Topologies from top

Although initially attractive due to minimal dependence on complex electronics, the use of bus media, such as repeated Ethernet segments, is decreasing. For the most part, this is due to an increase in the reliability and flexibility of the technology that is implementing rings, stars, and meshes. In particular, bus LAN topologies are typically converted into stars using a LAN switch. This offers increased aggregate bandwidth and superior diagnostic capabilities.

Operational experience has also shown that a passive shared broadcast medium does not necessarily create a more reliable environment because a single misbehaving Ethernet card can render a bus LAN useless for communication purposes.

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