Which of the following is a strategy for solving latency and jitter issues?

Quality of Service (QoS) configuration is a strategy specifically designed to manage network traffic and prioritize certain types of data. In environments where latency and jitter are problematic, such as in VoIP or streaming applications, QoS allows network administrators to allocate bandwidth and control traffic to ensure that high-priority services receive the necessary resources to function efficiently. By implementing QoS, critical data packets can be prioritized over less important traffic, which reduces delays and maintains a smoother performance for time-sensitive applications.

The other strategies mentioned, like installing more routers or increasing the number of devices, do not directly address latency and jitter. More routers could complicate the network and potentially introduce additional latency. Similarly, adding more devices can lead to congestion on the network, worsening latency and jitter, especially if the network's existing infrastructure isn't capable of handling the increased load. Using unshielded cables is also typically not a viable solution as it could actually lead to more interference and signal degradation, which can worsen latency and jitter issues. Therefore, QoS configuration is the most effective approach to mitigate these problems and enhance overall network performance.