What configuration should be modified to restrict access to a business's WiFi network for customers?

Modifying MAC filtering is an effective way to restrict access to a WiFi network for customers. MAC filtering involves configuring the wireless router to allow or deny access based on the unique MAC addresses of devices. By enabling MAC filtering, you can create a list of approved devices that are permitted to connect to the network, which effectively limits access to only those authorized devices, preventing unauthorized access by other customer devices.

Using MAC filtering as an access restriction method is beneficial because it provides control over which devices can connect to the network without changing the network's SSID or altering the encryption settings. While it’s important to remember that MAC addresses can be spoofed, and this method should be part of a broader security strategy, it still serves as an immediate measure to manage who can connect to the business's WiFi.

Default SSID change, although it can enhance security by making the network less recognizable, does not inherently restrict customer access. QoS, or Quality of Service, is focused on managing network traffic to ensure efficient resource allocation and does not deal with access control. Encryption secures the data transmitted over the network but doesn't prevent unwanted devices from connecting. Therefore, MAC filtering stands out as the most appropriate choice for restricting network access.