Bus runs in a straight line from one network device to another. So if one gets disconnect then the all the devices connected down the line get disconnect.
Star runs to a central device like a switch, so if the switch itself fails then the whole network will be disconnected.
Ring is like a bus except it connects back onto itself. So if one device fails they all fail. The exception is if there is a redundant inside ring like that used in FDDI (fiber ring) then if both get disconnect from one device then they all do.
Mesh is high redundancy. Only one device would be disconnected if all the connections were to fail for that device. You can have many connections to other devices thats why its less likely to fail. The only cause for failure at this point is really the power and if you just don't have any. Even if one of the connections between two devices fail there is no effect on network and they can still communicate through other channels
Any device that fails in a star topology only disconnects the failing device from the network. The rest of the network is not affected.
The consequences if a connection fails Five devices arranged in a star topology (not counting the hub)
If five devices arranged in a mesh topology so we will have 10 links and 4 I/O ports in each hardware device. If any link goes down from them so it will be easy to find out which one is down and it won't effect on other links. But a bulk of wires and can create problem in re-installation and re-configuration.
Topology refers to the physical method of wiring the devices to each other, what kind of connection devices are used, etc.
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An old topology called Token Ring
Topology is the actual layout of the network, for instance, where the routers and other devices are located. That would be the networks topology.
The arrangement of computers on a network is called topology. It describes how the individual computers are connected to each other and to the network.examples of topology are Star topology, ring topology, mesh topology, bus topology.
Connections between devices Devices
Topology is the structure that describes how devices in a Network are connected.Bus Topology: Directly connects all devices to network i.e utilises a single Physical medium for Data transmission between devices.Star Topology: Connects all devices in network through a Central Network connecting device such as Hubs & Switches.Advantage of Bus Topology is that less connecting cable is used.Advantage of Star Topology is that Network can function in case one or more devices fail.Disadvantage of Bus Topology is that whole Network goes down if one device fails.Disadvantage of Star Topology is that it requires physical connecting medium from Central device to the connecting device i.e more expensive.
Ring
it is the bus
Bus topology, as compared to a star topology costs less because less cabling is required to connect multiple devices together.
Group of devices connected together forms a Network & structure (design) in which they interconnect is called Topology.