What characteristic is associated with the best network topologies?

The characteristic associated with the best network topologies is good speed and reliability. This is because optimal network designs prioritize efficient data transfer and consistent performance. A topology that provides good speed ensures that data packets can move quickly between devices, reducing latency and improving overall user experience.

Reliability is equally important as it indicates the network's ability to maintain consistent performance, even in the event of a fault or failure in one of its components. For instance, star topology, which connects all devices to a central hub, allows for quick identification and troubleshooting of issues without affecting the entire network, leading to higher reliability.

In contrast, while some other options may focus on attributes like cost or maintenance, they don't align with the primary goals of effective network design, which center around performance and dependability. Therefore, a network that can offer both good speed and reliability generally serves its users more effectively and efficiently.