在现在的"延迟确认"（delayed-ACK）TCP应用中，目的端收到两个包时发送一个确认，那么只要接收到的包中有一个CE包，确认包中的ECN-Echo标志就要设置。
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Delayed ACK 延迟ACK ; 确认机制 ; 延迟应答
The client selects the value of its SACK options whenever transmitting a delayed ACK.
在传输延迟的应答时客户机选择SACK选项的值。
For the non-SACK test cases, I used the typical length of the delayed ACK queue reported by the client as an approximation of the lower bound of the sender's window size.
对于非sack测试用例，我使用客户机报告的延迟应答队列的典型长度作为发送方窗口大小的近似值。
By analyzing RTT's component, it is found that various transmitting delay and delayed ACK bring obvious errors in using RTT as the signal of network congestion, and affect DCA algorithms' veracity.
通过对rtt的分析发现，变化的传输延迟和延迟ack将对使用RTT指示拥塞引入明显误差，从而影响dca算法的准确性。
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