Which of the following network topologies is the most simple and cost-effective?

Question

BlackTom AI · Accepted Answer

Bus topology uses a single central cable (backbone) to which all network devices attach, so it is inherently simple and inexpensive compared with the alternatives.

1. Relevant knowledge points and concepts
- Bus topology: single backbone cable; nodes tap into the backbone; requires terminators at ends; minimal cabling and no central device.  
- Star topology: each node connects to a central hub or switch; more cabling and a central point of failure (hub).  
- Ring topology: nodes connected in a closed loop; often uses token passing; every node must be connected in series.  
- Mesh topology: nodes have multiple point-to-point links; a full mesh requires n(n−1)/2 links for n nodes, which becomes extremely costly as n increases.

2. Step-by-step reasoning
- Compare cabling and device costs: bus uses one backbone cable regardless of number of nodes (until length limits), so cable cost ≈ constant for small networks. Star requires a separate cable from each node to the hub: cabling cost ∝ n, plus cost of the hub/switch. Mesh (full) uses n(n−1)/2 links — for example, with n = 10 nodes, links = 10×9/2 = 45 links — very high cost. Ring requires cabling around the loop and specialized configuration.  
- Installation and complexity: bus is easiest to install and troubleshoot in small setups (single cable, few connectors). Star and ring need more configuration and physical connections; mesh is the most complex to install and maintain.  
- Cost-effectiveness metric: lowest equipment and cabling cost plus simplicity favors the bus topology, especially for small networks.

3. Intermediate calculation/example
- Mesh links formula: links = n(n−1)/2. For n=5, links=5×4/2=10 links, illustrating rapid growth in cost/complexity.

4. Why the correct answer is correct
Bus topology minimizes hardware and cabling expenses and is straightforward to implement, making it the most simple and cost-effective choice among the listed options.

5. Why other options are incorrect
- Star: more cabling and a hub/switch increases cost.  
- Ring: needs a loop and can be more complex to manage and extend.  
- Mesh: very high cost and complexity due to many point-to-point links.

Conclusion: The most simple and cost-effective topology is Bus Topology, matching the provided answer.

Which of the following network topologies is the most simple and cost-effective?单项选择题

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