What is an important aspect of ensuring wireless network security?

Frequent password changes are a critical aspect of ensuring wireless network security because they help mitigate the risk of unauthorized access. Regularly updating passwords reduces the chance that an attacker can exploit a static password over time. If an individual gains access to the network, an outdated password might provide continued unauthorized access until it is changed. By implementing policies for frequent password updates, organizations can enhance their security posture and protect sensitive data, critical resources, and ensure that only authorized users have access to the network.

The other options do not provide comprehensive security solutions. Using guest networks only limits the effectiveness of securing the main network, particularly if the guest network does not have the same level of protections. Setting up VPN access is beneficial but does not directly address password management which is fundamental for initial access control. Finally, requiring all devices to use wired connections may not be feasible or practical in many environments, and it also eliminates the convenience and flexibility that wireless technology provides without directly addressing fundamental security practices like password management.