These include the following:

• There can be a security problem, since every node may see every message, even those that are not destined for it.

• Diagnosis/troubleshooting (fault isolation) can be difficult, since the fault can be anywhere along the bus.

• There is no automatic acknowledgment of messages, since messages get absorbed at the end of the bus and do not return to the sender.

• The bus cable can be a bottleneck when network traffic gets heavy. This is because nodes can spend much of their time trying to access the network.

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