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
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