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Oct 13, 2022
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Update tcp-reliability-guarantee.md #1840

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4 changes: 2 additions & 2 deletions docs/cs-basics/network/tcp-reliability-guarantee.md
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Expand Up @@ -7,7 +7,7 @@ tag:

## TCP 如何保证传输的可靠性？

1. **基于数据快传输** ：应用数据被分割成 TCP 认为最适合发送的数据块，再传输给网络层，数据块被称为报文段或段。
1. **基于数据块传输** ：应用数据被分割成 TCP 认为最适合发送的数据块，再传输给网络层，数据块被称为报文段或段。
2. **对失序数据包重新排序以及去重**：TCP 为了保证不发生丢包，就给每个包一个序列号，有了序列号能够将接收到的数据根据序列号排序，并且去掉重复序列号的数据就可以实现数据包去重。
3. **校验和** : TCP 将保持它首部和数据的检验和。这是一个端到端的检验和，目的是检测数据在传输过程中的任何变化。如果收到段的检验和有差错，TCP 将丢弃这个报文段和不确认收到此报文段。
4. **超时重传** : 当发送方发送数据之后，它启动一个定时器，等待目的端确认收到这个报文段。接收端实体对已成功收到的包发回一个相应的确认信息（ACK）。如果发送端实体在合理的往返时延（RTT）内未收到确认消息，那么对应的数据包就被假设为[已丢失](https://zh.wikipedia.org/wiki/丢包 )并进行重传。
Expand Down Expand Up @@ -116,4 +116,4 @@ ARQ 包括停止等待 ARQ 协议和连续 ARQ 协议。
4. [https://github.com/wolverinn/Waking-Up/blob/master/Computer%20Network.md](https://github.com/wolverinn/Waking-Up/blob/master/Computer%20Network.md )
5. TCP Flow Control—[https://www.brianstorti.com/tcp-flow-control/](https://www.brianstorti.com/tcp-flow-control/ )
6. TCP 流量控制(Flow Control)：https://notfalse.net/24/tcp-flow-control
7. TCP之滑动窗口原理 : https://cloud.tencent.com/developer/article/1857363
7. TCP之滑动窗口原理 : https://cloud.tencent.com/developer/article/1857363