Question

TCP RFC提到接收方应该为它收到的每2个完整大小的段发送一个ACK（假设它们是有序的），并且不应该延迟ACK。

考虑到窗口大小为8个段，发送方发送8个完整段，这是否意味着，即使接收到8个段，接收方也会发送4个ACK？

是否可以通过一个ACK确认所有8个段？

Answer 1

我只是复制粘贴RFC的重要部分：

4.2.3.2何时发送ACK段

        A host that is receiving a stream of TCP data segments can
        increase efficiency in both the Internet and the hosts by
        sending fewer than one ACK (acknowledgment) segment per data
        segment received; this is known as a "delayed ACK" [TCP:5].

        A TCP SHOULD implement a delayed ACK, but an ACK should not
        be excessively delayed; in particular, the delay MUST be
        less than 0.5 seconds, and in a stream of full-sized
        segments there SHOULD be an ACK for at least every second
        segment.

可以在此处找到完整的RFC：RFC 1122

收到2个以上全尺寸段后发送的ACK数量是多少？

1 个答案: