Wi-Fi sniffers are used for network analysis & troubleshooting, performance analysis & benchmarking, and eavesdropping for clear-text passwords. Encryption will not allow changing or adding the data in wifi sniffers. To protect the network from packet sniffers, encryption like TLS or SSL is used. VPNs can protect you from network sniffers. It can prevent packet sniffers from monitoring the traffic for the websites you visit. So, to protect yourself from such attacks, avoid using public networks and use HTTPS. Public wireless networks are more vulnerable to packet sniffing attacks. Suggested reading => Best WiFi Signal Boosters By using them with other tools, malware and malicious content can be delivered through manipulated packets. It is also used by hackers for stealing information and data. Wi-Fi Packet Sniffer has the ability to work as a spying tool. It is legal to use WiFi Sniffers for administrative work or network monitoring. It should have features and functionalities for diagnosing & investigating network problems, monitoring network usage, discovering vulnerabilities, identifying configuration issues & network bottlenecks, and filtering network traffic. While selecting the WiFi Sniffer, consider its ability to monitor, intercept, and decode the data. Further reading => Best Bluetooth Audio Receivers

How to install wireshark on modem