最大传输单位(MTU)大小。

Maximum transmission unit (MTU) size.

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我们这些黑客长大了…这个世界充满着电子，开关，和美丽的波特（信号传输单位）。

This is our world now… the world of the electron and the switch, the beauty of the baud.

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校验和是传输单位里二进制码(比特)的总数，因此接收者可以检验是否一样的比特数达到。

A checksum is a count of the number of bits in a transmission unit that is included with the unit so that the receiver can check to see whether the same number of bits arrived.

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