> For the complete documentation index, see [llms.txt](https://kerwin.gitbook.io/ruijie/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://kerwin.gitbook.io/ruijie/jiao-huan-chan-pin/path3/4.-pei-zhi-yu-fang-dos-gong-ji-de-ru-kou-guo-lv.md).

# 4. 配置预防DoS攻击的入口过滤

本部分包括以下内容：

* DoS攻击概述
* 在三层交换机上配置DoS过滤