What does network redundancy involve in high-availability systems?

Network redundancy is a fundamental concept in high-availability systems that ensures continuous service even in the event of a component failure. By duplicating critical components—such as servers, data paths, and network devices—organizations can maintain operations without interruption. If one component fails, the redundant component can take over immediately, providing a seamless user experience and preventing downtime. This strategy is essential for applications where reliability is critical and outages can result in significant losses, both financially and in terms of customer trust.

The other choices do not reflect the principle of redundancy. Reducing bandwidth does not contribute to high availability; simpler architectures might simplify management but may also increase vulnerability; upgrading devices focuses on improving performance rather than providing backup components for reliability. Hence, the correct focus on duplicating critical components solidifies network redundancy as the core strategy in high-availability systems.