Bus networks use a common backboneto connect all devices.the backbone function as a shared communication medium that devices attach or tap into with an interface connector.
Ethernet bus topologies are relatively easy to install and don't require much cabling compared to the alternatives.
Ring
in a ring network, every device has exactly two neighbours for communication purposes.
all messages travel through a ring in the same direction(either clockwise or counterclockwise).
ring topologies are found in some office buildings or school campuses.
Star
Many home networks use star topology.compared with bus topolgy,star require more cable.
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