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　　摩西角海岸有一群技巧娴熟的潜水少年，当其中的一员神秘失踪后，他们对一系列秘密和迹象展开了调查--------------------------------ACK reflection attack is a common reflection attack technique, Using TCP three-way handshake, When the source IP address of SYN is disguised as Target's IP and the transmitter try to establish TCP connection, the reflector's response will be directly forwarded to Target. In the process of attack, a large number of ACK responses responded by the reflector will be sent to Target by controlling a large number of controlled hosts to perform the clock operation, thus occupying Target's network bandwidth resources and causing denial of service.Attackers can use ICMP/IGMP flood attacks and UDP flood attacks to directly launch distributed denial of service attacks that consume network broadband resources. However, this attack method is not only low, but also easy to find the source of the attack. Although attackers can hide by forging the source IP address, a better way is to use reflection attack technology.张牧之一声惊叹，指着那个头名位置，地字肆号……是肆号？？肆号？是肆号啊。Peripheral functions are defined as slices in Spring's AOP idea of slice-oriented programming.1. E-mail: zyf@nhsa.gov.cn; Jjjgs@nhsa.gov.cn