What is a feature that can be used by an administrator to prevent unauthorized users from connecting to a wireless access point?
- MAC filtering
- software firewall
- WPA encryption
- proxy server
Explanation: Limiting a certain set of MAC addresses to connect to an access point is a way to ensure that only those devices are allowed to use the wireless network. A software firewall is used to prevent other users from gaining access to the protected computer. Configuring WPA encryption does not guarantee that the unauthorized user will not find the way to connect to the network. A proxy server is mostly used to filter traffic based on content.