What feature allows users to restrict which devices can access a WiFi network?

The feature that allows users to restrict which devices can access a WiFi network is MAC Address filtering. This method utilizes the unique Media Access Control (MAC) address assigned to each network interface card (NIC) in devices. By configuring the router or access point to allow or deny specific MAC addresses, a user can effectively control access to the network.

Each device, whether it's a laptop, smartphone, or tablet, has a distinct MAC address that can be entered into the router's settings. By maintaining a list of permitted or blocked MAC addresses, the network administrator can manage which devices are granted or denied access, enhancing the network's security.

In contrast, IP Address allocation is more about assigning IP addresses to devices rather than restricting access. Network encryption secures data transmission but does not control which devices can connect. Public exposure settings relate to the visibility of the network rather than device restriction. Thus, MAC Address filtering provides a direct and effective method for securing network access based on device identification.