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Coaxial cable, or coax, is a type of electrical cable that has an inner conductor surrounded by a tubular insulating layer, surrounded by a tubular conducting shield.

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All the data on the star topology passes through the central device before reaching the intended destination. Hub acts as a junction to connect different nodes present in Star Network, and at the same time it manages and controls whole of the network.

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The use of hub, a router or a switch as central device increases the overall cost of the network.
Too much dependency on central device has its own drawbacks. If it fails whole network goes down.

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Failure of one node or link doesn’t affect the rest of network. At the same time its easy to detect the failure and troubleshoot it.

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It is used in homes, offices, etc .

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and I will talk about about star topology.