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2. Star Network topology

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In star topology all devices or computers are connected to one centralized server. They are connected with server by hub.
 Star topology is used in that network where end points are directly reachable from central location. Because each nodes link to the server by different cables. There is no risk of data collisions. Each computer connected to the hub by its own cable segments only a single computer can transmit at a time and every computer on the network wait for message. Thus it is best on broadcasting architecture.
a.     Advantages
i.                    Devices are attached to server by its own cable, thus break down of cable affects only to that nodes.
ii.                  Failure of single node will not affect the rest of the network.
iii.                Central hub can be represent with other having more ports to plugs the nodes.
b.     Disadvantages
i.                    Failure of central hub will affect whole network.
ii.                  More expensive.

iii.                Required more cables and costly hub.

Fig: Star Network Topology 

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