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The real threat lies in amplification attacks using reflection principles, In the network service protocol provided by the reflector, There needs to be an asymmetric amount of request and response data, The amount of response data needs to be greater than the amount of request data, The larger the ratio of the response data to the request data, the larger the amplification factor of the amplifier, and the more obvious the effect of consuming bandwidth resources caused by amplification attacks. However, the number deployed on the Internet is very small, so amplification using the network service cannot achieve a large flow and can only be used as an auxiliary means.Suppose the attacker is in an "interconnected" network (e.g. An Autonomous system? System), whose ISP restricts the input and output filtering of the attacker's network traffic, will be able to prevent this spoofing attack-if this method can be deployed to the correct location by the organization. This defense method of traffic input and output filtering will restrict some legitimate communications, such as the mobile IP triangular routing operation mode, so it cannot be widely deployed. IP Security Protocol (IPsec) also provides an excellent way to resist spoofing packets, but this protocol cannot be used due to deployment restrictions. Since it is usually impossible for the server side to require the ISP of the link initiator to implement address filtering or require it to use IP security protocols, more complex solutions are needed to resist this spoofing attack disguised as multiple addresses, which will be discussed later.第一季里邀请大学同学的李俊基（李伊庚 饰），这次把魔手伸向高中同学。Among them, Growth Insurance and Spark Thinking are remarkable in terms of financing frequency and amount. The two companies announced the completion of their respective B + rounds of financing in May and June this year respectively. Growth Insurance B rounds of financing totaled 300 million yuan and Spark Thinking B rounds of financing totaled 35 million US dollars. In addition to the relatively high financing rounds of growth insurance and spark thinking, the financing rounds of other online children's thinking ability training companies are basically Pre-A and angel rounds.A2.4. 1 Localized neurodermatitis is qualified, and generalized neurodermatitis is qualified after treatment with symptoms disappearing or basically disappearing.很快，大家就明白了其中缘故。