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Ð ÐThe ring is difficult to debug.
Ð ÐAll computers must be turned on in order for them to connect with one another.
Star Topology
A star topology for a LAN is one in which each node is connected to a central connection point, such as a hub or switch.
A star requires more cable than, say, a bus, but the benefit is that if one cable fails, only one node is affected. Each
device in the network is connected to a hub, which is a central device. If one device wishes to send information to
another, it must first send the information to the hub, which then sends the information to the specified device.
Hub
Advantages
Ð ÐIt is extremely dependable; if one cable or device breaks, the others will continue to function.
Ð ÐIt is efficient since no data collisions can occur.
Ð ÐRobust in nature and is easier to implement.
Ð ÐFault detection is simple.
Ð ÐWhen attaching or disconnecting devices, there are no network interruptions.
ÐEach device only needs one port to connect to the hub.
Ð
Ð ÐWhen N devices are connected in a star, the number of wires necessary to connect them is N. As a result, lining up
is simple.
Disadvantages
Ð ÐMore cable is required than with a linear bus.
Ð ÐNodes associated with the connecting network device (network switch) are disabled and unable to communicate
with the network.
Ð ÐDue to the value of the connected devices, it is more expensive than a linear bus topology (network switches)
Ð ÐIf the hub fails, the entire system fails, and none of the devices can function without it.
Ð ÐThe hub necessitates greater resources and regular upkeep.
Ð ÐExtra hardware (hubs or switches) is required, which increases the cost.
Ð ÐThe performance is based on a single concentrator, the hub.
Basics of Networking 125

