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From the perspective of service, DDoS protection is essentially a war in which users are the main body and rely on anti-D protection systems to compete with hackers. In the whole process of data confrontation, service providers often have absolute initiative. Users can base on specific rules of anti-D system, such as traffic type, request frequency, packet characteristics, delay interval between normal services, etc. Based on these rules, users can better resist DDoS of the seven-layer class and reduce the resource overhead of the server on the premise of satisfying the normal service itself. The detailed schematic diagram is as follows:The seven-layer model of OSI and its description are as follows:1. Introduction to Publish and Subscribe ModePublic String getValue () {Jin Zhengxun　　另一方面，新训消防员江桐渐渐喜欢上了看似退缩、怕事的消防员王大印。夹在家庭的极力反对和王大印的躲躲藏藏中，江桐想要探究王大印背后的故事，也在这个过程中让王大印慢慢成为了有使命感和责任心的男人。