UDP headers also include something called a checksum, which allows the data to be verified for correctness.

UDP 标头还包括一种称为校验和的东西，它允许验证数据的正确性。

In UDP, the checksum value is stored in 16 bits.

在 UDP 中，校验和值以 16 位存储。

If that sum is the same as the checksum sent in the header, all is well.

如果该和与标头中发送的校验和相同，则一切正常。

Second, TCP requires that once a computer has correctly received a packet – and the data passes the checksum – that it send back an acknowledgement, or " ACK" as the cool kids say, to the sending computer.

其次，TCP要求一旦计算机正确接收到数据包 - 并且数据通过校验和 - 它就会向发送计算机发送回确认，或者像很酷的孩子所说的“ACK”。