After using WiFi monitoring tools, if you discover devices that should not be on your network, it is best to take the Mac Address of the unknown device, and add this to the Wireless Mac Filter of your current wireless router.
Alternatively, you can change the Wireless Encryption Key (also sometimes called a WiFi password), of both your wireless router, and all devices that connect to your wireless network.
Finally, if you are still detecting unknown devices after changing your WiFi password, these devices are likely connected over ethernet (wired), or you might consider replacing your wireless router with one that is more secure.
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