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fix(spelling): fix Send Unacknowledged 错别字 #356

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fix(spelling): fix Send Unacknowledged 错别字 #356

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2 changes: 1 addition & 1 deletion network/3_tcp/tcp_feature.md
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Original file line number Diff line number Diff line change
Expand Up @@ -239,7 +239,7 @@ TCP 滑动窗口方案使用三个指针来跟踪在四个传输类别中的每
![SND.WND, SND.UN, SND.NXT](https://cdn.xiaolincoding.com/gh/xiaolincoder/ImageHost2/%E8%AE%A1%E7%AE%97%E6%9C%BA%E7%BD%91%E7%BB%9C/TCP-%E5%8F%AF%E9%9D%A0%E7%89%B9%E6%80%A7/19.jpg?image_process=watermark,text_5YWs5LyX5Y-377ya5bCP5p6XY29kaW5n,type_ZnpsdHpoaw,x_10,y_10,g_se,size_20,color_0000CD,t_70,fill_0)

- `SND.WND`：表示发送窗口的大小（大小是由接收方指定的）；
- `SND.UNA`（*Send Unacknoleged*）：是一个绝对指针，它指向的是已发送但未收到确认的第一个字节的序列号，也就是 #2 的第一个字节。
- `SND.UNA`（*Send Unacknowledged*）：是一个绝对指针，它指向的是已发送但未收到确认的第一个字节的序列号，也就是 #2 的第一个字节。
- `SND.NXT`：也是一个绝对指针，它指向未发送但可发送范围的第一个字节的序列号，也就是 #3 的第一个字节。

- 指向 #4 的第一个字节是个相对指针，它需要 `SND.UNA` 指针加上 `SND.WND` 大小的偏移量，就可以指向 #4 的第一个字节了。
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