In a star network, several
devices or computer are connected to one centralized computer as shown
in figure. The advantage of star networks is that none of the other
computer can communicate with each other if the central computer breaks
down. If its is desired to transmit information from one computer to
another. Only sending the details the central computer can do it, which
in turn send them to the destination. A star network is used in banking
sector for centralized record keeping in an on-line office environment.
A star-network; extended out in different directions from a central
location. This locations is occupied by physical equipment known as a
Hub.
Each computer is connected to the hub by its own cable segment. Only a
single computer can transmit at a time and every computer on the network
will examine the data to see if it is meant for them. Because of the
star network is made up of single device attached to the end of single
cables a break in the cable affects only the device attached to that
cable. Failure of a single node will not affect the rest of the network.
If, however the central hub fails the entire network will go down.
Star topology can be implemented as a passive or an active design
depending on the type of Hub. A passive hub is often utilized for small
networks. All data received by a passive Hub is passed directly to all
computers connected to the Hub. An active Hub, amplifies incoming
signals before transmitting them to the other computers.