What Are Star And Extended Star Topologies?


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Star and extended star topologies:The star topology is the most commonly used physical technology in Ethernets LANS, when installed , the star topology resembles spokes I n a bicycle wheel. The star topology is made up of a central connection point that is a device such as a hub, switch, or router , where all the cabling segments meet. Each host in the network is connected to the central devices with its own cables although a physical star topology costs more to implement than the physical bus topology , the advantage of star topology make it worth the additional cost.

Because each host it connected to the central device with its own cable, when that cable has a problem , only that host is affected, the rest of the network remains operational this benefit is extremely important and is why virtually every newly designed Ethernet a central connection point might be desirable for security or restricted access , but this is also a main disadvantage of a star topology .if the central device fails, the whole network become disconnected .when a star network is expanded to include an additional networking device that is connected for the main networking device, it is called an extended star topology

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