Which aspect of wireless networking is generally reduced with network redundancy?

The aspect of wireless networking that is generally reduced with network redundancy is performance reliability. Network redundancy involves implementing additional hardware or pathways to ensure that if one part of the network fails, there are backup systems or connections that maintain the network's functionality.

By introducing redundancy, such as multiple access points or alternative routing paths, you're able to enhance reliability significantly. This way, if one link in the network fails, the redundant systems can take over, providing continuous service and minimizing disruptions. As a result, performance reliability improves because the chances of experiencing downtime or service interruptions are greatly diminished.

While the other options may have their implications in a wireless environment—such as costs potentially rising with additional hardware, congestion sometimes alleviated through better distribution of traffic, and security measures potentially being more complex with additional devices—they do not directly reflect the primary benefit of redundancy, which is the enhancement of reliability in performance.