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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:这么推算下来，17年前，老爷子就中举了，那时他还很年轻，25岁。好容易从弟妹中间挤出来，葫芦急忙过去见爷爷奶奶和爹娘。　　安东尼奥（乔恩·塞达 Jon Seda 饰）是汉克手下的一员要将，尽管他曾经和汉克有过一段不太愉快的过去，但他依然将在汉克手下工作当做是一种光荣。其他身在行动组的组员们亦是如此，能够跻身成为情报组中的一员是他们梦寐以求的事情。然而，情报组的工作谈何容易，加入了情报组，就以为这要和芝加哥最邪恶、最凶残的罪犯展开正面交锋。This article has been published by Netease Cloud Community authorized by author Lin Weihao (please do not reprint without permission). The original link: DDoS Attack and Defense: From Principle to Practice (Part I)