> For the complete documentation index, see [llms.txt](https://lfool.gitbook.io/computer-network/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://lfool.gitbook.io/computer-network/di-san-zhang-shu-ju-lian-lu.md).

# 第三章：数据链路层

![](https://2396550738-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-M8zvqNNVZctOHx6v8No%2F-MDp3pfJ-QzWnh8v_lcS%2F-MDp6-dN46JrBQvUTKZ7%2F%E6%95%B0%E6%8D%AE%E9%93%BE%E8%B7%AF%E5%B1%82.svg?alt=media\&token=3783cb67-10fa-49c6-8605-90816f3f5298)