Compare structure, advantages, and disadvantages of bus topology, star topology, and ring topology.

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Bus topology: structure - all devices connect to a single backbone cable using T-connectors, with terminators at both ends. Advantage - requires the least cabling and is cost-effective and simple to set up. Disadvantage - fault-prone; if the backbone breaks, the whole network fails. Star topology: structure - all devices connect to one central device (hub, switch, or router) using separate cables. Advantage - fault tolerant; failure of one device/cable does not affect others. Disadvantage - if the central device fails, the entire network goes down. Ring topology: structure - every device connects to exactly two others, forming a closed loop, often using token passing. Advantage - data collisions are prevented since only the token holder can send data. Disadvantage - if any device or cable in the ring fails, the whole network can stop working.