> 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-si-zhang-wang-luo-ceng.md).

# 第四章：网络层

![](https://2396550738-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-M8zvqNNVZctOHx6v8No%2F-ME3tD2qfIY4W-5ALrby%2F-ME3x-WjLlnn5tvqU9Dr%2F%E7%BD%91%E7%BB%9C%E5%B1%82.svg?alt=media\&token=8fe4a173-053d-43cf-8158-b118c1b24d98)