> For the complete documentation index, see [llms.txt](https://mm.ricky.moe/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mm.ricky.moe/network/ji-suan-ji-wang-luo/yunshuceng/udp.md).

# UDP

1. UDP 是 无连接的

2. UDP 使用 尽最大努力交付，但不保证可靠交付。

3. UDP 是面向报文的。

4. UDP没有拥塞控制。很多实时应用如IP电话、实时视频会议等，要求源主机以恒定的速率发送数据，并且允许在网络发生拥塞时丢失一些数据，但不允许数据有太大的时延。UDP正好适合这种要求。

5. UDP支持一对一、一对多、多对一和多对多的交互通信

6. UDP的首部开销小


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