Wifi or Hardwired ?
When my Macbook Pro is connected to wifi and a hardwired Ethernet cable does it know to use the hard wired connection for connecting to the internet?
MacBook Pro 15", macOS 10.14
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unless you manually change the service order or if a service fails then Ethernet is prioritized over wi-fi. If that network cant find a path to your destination it will try the wi-fi connection if available.
you can set this under
>System Preferences>Network / set service order (under the gear icon)