随着信息化的日益发展,局域网成为了各单位部门运行中的不可或缺的组成部分。但是,ARP的攻击已成了局域网使用中的一块心病,尤其是在学校,ARP的攻击对正常的教育教学工作带来了极大的不便。本文以校园网中实际发生的案例为样板,以解决问题为目标引导学生在过程中探索是什么和为什么的问题。通过实践提出一些实用性较强且操作简单的检测和抵御攻击的方法。 With the increasing development of information technology, the local area network has become an indispensable part of the operation of various departments and units. However, the ARP attack has become a use case of the LAN, especially in schools. The ARP attack brings great inconvenience to the normal education and teaching work. In this paper, the actual case of campus network as a model to solve the problem as the goal to guide students in the process of exploring what and why the problem. Put forward some practical and easy to use methods to detect and resist attacks.