Raspberry Pi4 cannot connect to internet using wifi and ethernet cable at the same time?

The Raspberry Pi is a series of credit card-sized single-board computers developed in the United Kingdom by the Raspberry Pi Foundation to promote the teaching of basic computer science in schools and developing countries.

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Raspberry Pi4 cannot connect to internet using wifi and ethernet cable at the same time?

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I am new to both Raspberry and NodeRed.
My goal is to connect the Raspberry to a machine via a network switch and then use the Raspberry to pass the data to internet via its wifi.
Before I started any connection, I am testing the Raspberry. The Raspberry can connect to internet using wifi or talk to a switch, but it cannot do both at the same time. For example, I will lose connection of the wifi if I connect the ethernet cable. How to fix it?

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