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These are the simplest attacks. The attacker simply sends a large number of packets to the target, thus exhausting all resources. The resources used may only be bandwidth. These attacks include ICMP and UDP flooding.80年代，老村长为了女儿上学读书，努力赚钱养家···　　一个微妙的转折发生在银河帝国建国后的12020年。哈里·谢顿，这个刚满32岁的年轻数学家，开创了“心理史学”，这门学科能用数学公式准确推演全人类的未来——“预言”从此成为一门可以信任的科学，人类由此可以看见未来...传说这块土地南方每时每刻都有成吨的银矿出土，本地货产又极其有限，在这种白银产量过于旺盛的情况下，神秘的东方货品和香料出奇地稀少而又畅销，无论是在本地销售还是运回欧洲都价格不菲。Endothermic theory: When the flame retardant is heated, endothermic reactions occur, such as decomposition, melting, sublimation, phase change, etc., which make the fiber dissipate heat rapidly and fail to reach the combustion temperature.Compared with other quite sophisticated network attacks, DDOS attacks are not only the use of attack techniques, but also a competition of resources, including network bandwidth resources and server resources. Without sufficient resources, it is nonsense to talk about defending DDOS attacks. Therefore, at present, the defense against DDOS attacks mainly lies in hardware protection, and software protection has little effect.