When a new TCP connection comes in from a client by means of a packet with the SYN bit set, the server creates an entry for the half-open connection and responds with a SYN-ACK packet.
当从客户机发来新的TCP连接时，数据包设置了SY n位，服务器就为这个半开的连接创建一个条目，并用一个SYN - ACK数据包进行响应。
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。
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。
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