Switches operate by recording the source MAC address as a frame enters a switch.

交换机的工作方式是帧在进入交换机时记录下MAC源地址。

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This means that you can verify the source of the information by using the MAC address of the sender (and the recipient, if necessary), providing an additional level of security.

这意味着您可以通过发送者（和接收者，如果必要的话）的 MAC 地址来验证信息的来源，额外提供了一级安全性。

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