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3.4 Note:《破茧记之中二校园》由开心麻花魏翔导演，何欢、高海宝、东靖川、李宝儿、张卓行、具哈娜、房程程、张宵思等主演。讲述了一群来自天南海北的大一新生带着各自的梦想，在校园里上演一幕幕搞笑、离奇、浪漫而又温馨有趣的故事。Liskov Substitution Principle, LSP (Richter Substitution Principle) means that subclasses must replace their parent types. In other words, in the process of software development, after the subclass replaces the parent class, the behavior of the program is the same. Only when the subclass replaces the parent class and the function of the software is not affected can the parent class be truly reused, and the subclass can also add new behaviors to the parent class. In order to look at an example of violation of LSP principles, the specific code is as follows:Let's give another example.This standard is drafted by the Flight Standards Department of the General Administration of Civil Aviation of China.Reflection attack is also called amplification attack. This kind of attack is mainly based on UDP protocol. Common attack types include NTP, DNS, etc. Generally, the traffic of request response is much larger than the traffic of request itself. Attackers can create large-scale traffic sources with small traffic bandwidth through the characteristic that traffic is enlarged, thus launching attacks on targets. Reflective attacks are not strictly a kind of attacks. They only use the business characteristics of certain services to launch Flood attacks at a lower cost. The detailed schematic diagram is as follows: