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Using redundant capabilities in a network design primarily serves the purpose of ensuring that connections remain operational during failures. Redundancy is crucial in maintaining the availability and reliability of network services. When one component, such as a router, switch, or link, fails, redundant systems can immediately take over, allowing for seamless communication without interruptions.

This design principle helps to minimize downtime, maintain service continuity, and improve overall network resilience against hardware failures, outages, or other disruptions. In environments where high availability is critical, such as data centers or enterprise networks, implementing redundancy becomes essential to meet service level agreements (SLAs) and maintain user confidence in the network's reliability.

While other choices might seem plausible, they do not align with the primary purpose of redundancy in network design. Increasing latency and reducing throughput contrast with the goals of redundancy, which typically focus on performance consistency and data integrity. Therefore, the emphasis on keeping connections operational during failures underscores the importance of robustness in modern network architecture.