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In the case of a reflection attack, An attacker uses a controlled host to send a large number of packets, The special feature of these packets is that the destination IP address points to the server, router and other devices as the reflector, while the source IP address is forged as the IP address of the target. When the reflector receives the packet, it will think that the packet is a request sent by the attacked bird, so it will send the corresponding data to the target.In addition, there are two attached drawings.这时，他们已经出了寨子，沿着一条落满枯叶的小径往山腰左拐。该剧由崔贞允、李钟文、姜成民等主演，主要讲述了以富贵和名誉为象征的清潭洞里的隐秘欲望以及揭露了上流社会的丑陋现象。The reason why the logic for creating an object is put into a separate class is that it can be used by multiple clients. And separates the creation and use of objects. However, this design also has many defects. First of all, SimpleFactory is a specific class, so we must program for the implementation, making the system lose its flexibility in this respect. Second, if we add new products, we have to modify the code in SimpleFactory, which violates the opening and closing principle. The above model is also called simple factory. He does not appear in GOF mode, it is more like a programming habit.This standard mainly stipulates the medical conditions of flight students.