Ack: Indicates that the acknowledgment number field is significant.
ACK：表明确认号字段是有意义的。
The purpose of this duplicate ACK is to let the other end know that a segment was received out of order, and to tell it what sequence number is expected.
这个相同应答的意图是让对端知道一个分片被收到的时候出现问题，并且告诉它希望得到的序列号。
In some digital communication protocols, ACK is the name of a signal that data has been received successfully (for example, with an acceptable number of erro).
在一些数字通信协议，ACK的名字是一个信号，数据已经收到成功(例如，使用一个可接受的埃罗)。
In some digital communication protocols, ACK is the name of a signal that data has been received successfully (for example, with an acceptable number of erro).
在一些数字通信协议，ACK的名字是一个信号，数据已经收到成功(例如，使用一个可接受的埃罗)。
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