Ack: Indicates that the acknowledgment number field is significant.
ACK：表明确认号字段是有意义的。
First is the definition of this Acknowledgment or ack; both SOAP stacks must understand what an ack is: what it looks like, what it means, and how to send it.
首先是Acknowledgment或者ack的定义；两个soap堆栈都必须理解ack是什么：其像什么，它意味着什么，以及如何发送它。
TCP may generate an immediate acknowledgment (a duplicate ack) when an out - of-order segment is received.
当收到一个出问题的分片，Tcp立即产生一个应答。
TCP may generate an immediate acknowledgment (a duplicate ack) when an out - of-order segment is received.
当收到一个出问题的分片，Tcp立即产生一个应答。
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