In a star topology, the host communicates directly with each node through the external switch. You must use an external switch
in a star topology; for network synchronization, you must use an external IEEE 802.1AS switch. Redundant links are recommended, but optional, in this topology. You must configure the network properly with a recommended
external switch before creating redundant links in the network.
Advantages:
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Unpowered nodes and/or node failure does not disrupt network communication with other nodes
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Failure of any single Ethernet cable does not disrupt network communication when you have a redundant link
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Additional nodes or heavier network traffic affects network performance less than the other topologies
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Simple installation, expansion, and troubleshooting
Disadvantages:
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Most costly of the recommended topologies
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Requires an external switch (external IEEE 802.1AS switch for network synchronization)
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Covers the least distance