I think it is the Ethernet card or the Wifi card
<u>Switches</u> increase network performance by reducing the number of frames transmitted to the rest of the network.
Switches are an integral part of networks assigned the role to serve as the means to share information among different devices.
Switches perform their function by supervising and controlling the flow of data to the intended devices thus preventing the undesired flow of data to all the devices in a network which improves the performance of the network. Switches can also play a role to prevent errors as it checks the data prior to transmitting the data forward.
Switches determine the devices to which the data packets are to be sent by using their media access control (MAC) address. All hardware units connected to a system have their unique MAC address. Switches identify the MAC address of the device that sends the frames and then interpret the MAC address of the target device thus preventing the frames to pass towards the rest of the network.
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