Some devices, like laptops, will have multiple network adapters that allow them to connect to Wi-Fi and Ethernet at the same time, but should Wi-Fi be turned off when using Ethernet? Wi-Fi does not need to be turned off when using Ethernet, it will just mean that network traffic isn’t accidentally sent over Wi-Fi when you intend for it to be going over Ethernet. It will also provide more security as there will be fewer routes into the device. If you don’t care about whether your network traffic is traveling over Wi-Fi or Ethernet, there is no damage in leaving Wi-Fi turned on. But if you want to, there are various ways to disable Wi-Fi when using Ethernet on the device.
Should I Turn Off Wi-Fi When Using Ethernet?

You don’t need to turn off Wi-Fi When Ethernet Is Connected

Depending on which devices you have, you could find that some only have a single network adapter that authorizes them to connect merely to Ethernet or Wi-Fi. While some may have multiple adapters that authorize them to make use of both. Let us assume you are in the position where your device can connect to your home network using both Ethernet and Wi-Fi. Nevertheless, Ethernet generally offers better performance and more stability compared to Wi-Fi.

Ethernet and Wi-Fi Be can be used at the same time

It is possible and thanks to the router, which contains both Ethernet ports and Wi-Fi antennas, which connect to a separate antenna that is located inside. The separate antenna is what creates the local area network and makes sharing a connection among the connected devices possible. A device that is connected to the network using Wi-Fi will be able to communicate with a different device that is connected via Ethernet as they ultimately share the same connection. The method in which they initially connect may be different, but this does not matter in the long run. A device like a laptop will have multiple network adapters that will allow it to connect using both Wi-Fi and Ethernet. Often, it will end up causing a conflict which results in no connection at all, when you use both of the connection. Both adapters can be used to form the initial connection at the same time, but only one of them will be actively used. An Ethernet connection is generally faster than a Wi-Fi connection and provides greater reliability and security. If you want to turn it off the Wi-Fi connection here is the guide:

Ways to turn off automatically the Wi-Fi when Ethernet is connected. 

Other users need to use both wireless and wired network types because of their work nature. Ethernet provides faster network speeds as compared to wireless connections. If you need to use the internet with high speed due to heavy software downloading or for quick connectivity, then you will need to use Ethernet the wired connection.

Configure Network Adapter Settings

Right click on your connected Wi-Fi from system tray icon and go to  “Open Network and Sharing Center”. Window will open that shows your networks. Click on your connected Wi-Fi connection. A Wi-Fi status window will open. Go to its Properties to view them. Under the Network tab, click on Configure button. 

Bridge Checker

If you are using Ethernet LAN cable or WI-FI, it will automatically switch between any one of them by disabling the other network. It is quite simple and easy to use.
  • It enables one network at a time.
  • It disables the Wireless connection if you are connected to a wired connection.
  • It disables the wired connection if you are connected to Wireless connection.
  • You need administrative privileges to use Bridge Checker.
  • It supports both 32bit and 64bit Operating System.
  • It is supported on Windows and Mac.

This tool is not free to use, you can use it for a month as a trial period. If you find Bridge Checker functional, proceed for its license and buy it.

Turn off Wi-Fi on Your Router

How you turn off the Wi-Fi functionality will vary from one router to another, so I will show you the guide.

  • Login to your router
  • Click on Advanced Settings
  • Click on Wireless
  • Set Wireless Network Enable to No
  • Click on 5 GHz Wireless
  • Set Wireless Network Enable to No
  • Click on Apply
  • Log out of your router

Turning off Wi-Fi when using Ethernet is not needed: it just means that network traffic is not accidentally sent over Wi-Fi when you intend for it to be going over Ethernet. It also mentioned that turning Wi-Fi off when it is not in use will provide one less way of someone potentially being able to access your device, but continually turning it on and off can become quite a hassle. Turning off a device when you are not using it improves network security. When network devices are offline, hackers and Wi-Fi war drivers cannot target those devices. 

The security benefit alone makes this approach worthwhile. Nonetheless, because computer networks can be burdensome to set up to start with, some people do not want to break up a system once it is up, running, and working well. Unplugging or turning off the network devices you didn't use prevent damage by electric power surges. You were the one who benefit when you turn off the network you did not use.