Toplogi star network is a network that connects all the workstations to the hub / server or arrangement of data flow path within the
physical network node that connects one node
another. Connect all the cables on the host to one main point. This point is usually used Hub or Switch. Star topology is a form of network topologies in the form of convergence of the middle node to every node or user. Star network topology including network topology with high costs.

Excess Using STAR network
Relatively easy to modify and add computers to the network using star topology network aktvitas without disrupting ongoing. We only live to add new cable from our computer to a central location (central location)
Center of the star network is a good place to diagnose errors that occur in the network.
If one computer in the network is damaged then the computer will not make the entire network dead star. Hub can detect errors in the network and separate the damaged computer from the network and allows networks to operate again.
We can use several types of cable in the same network hub that can accommodate different types of cable
Lack Using STAR Network
Having a single point of error, lies in the hub. If the central hub fails, then the entire network will fail to operate.
Need a central point on the tool to re-broadcast or network traffic changes (switch network traffic).
Need more cables for all network cables must be pulled to one central point, so much more need more cable than other network topologies.