Encryption is a method of converting data into a code to prevent unauthorized access. Wireless networks often use encryption protocols like WEP, WPA, and WPA$2.$ The most secure is WPA$3,$ which is the latest version. It provides robust protections even when users choose passwords that fall short of typical complexity recommendations.

Step $2$

MAC Address Filtering

Explanation:

MAC Address Filtering is a method where the wireless network is configured to reject traffic from any wireless device that is not on the list of approved $($filtered$)$ MAC addresses. It adds an extra layer of security, but it can be time$-$consuming to manage the list of approved devices, especially in a large network.

Step $3$

Using a Firewall

Explanation:

A firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules. It establishes a barrier between a trusted internal network and untrusted external network, such as the Internet. This can help to prevent unauthorized access to the network.

Answer

The three techniques used to secure wireless networks are encryption, MAC address filtering, and using a firewall.