A MAC address is formatted as a six-byte, hexadecimal number, like this.
一个标准的MAC地址是6字节，16进制表示，就像这样。
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。
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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