TestOut LabSim A+ Certification Practice Exam

Which topology should you choose for a fault-tolerant interconnect of routers in a wide area network?

1. Star

2. Ring

3. Bus

4. Mesh

The correct answer is: Mesh

In a fault-tolerant interconnect of routers within a wide area network, a mesh topology is the most suitable choice. This topology allows for multiple connections between different nodes, meaning that if one connection fails, data can still be rerouted through alternate paths. The inherent redundancy of mesh topology ensures that there is no single point of failure, which is crucial for maintaining network reliability and uptime, particularly in wide area networks where geographical distances can complicate connections. In contrast, other topologies like star, ring, or bus have limitations that can compromise fault tolerance. For instance, in a star topology, if the central hub fails, all connected devices lose network access. Ring topologies have a similar vulnerability; if any connection in the ring breaks, the entire network can become inoperable unless mechanisms like dual rings are implemented. Lastly, a bus topology relies on a single central cable, and if that cable fails, every device on the network is affected. Thus, by choosing a mesh topology, you ensure robust fault tolerance and improved reliability for the interconnect of routers in a wide area network, accommodating potential failures without significant disruption to network services.