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Dynamically add some additional responsibilities to an object. In terms of adding functionality, the Decorator pattern is more flexible than generating subclasses.If an attack is detected, the management center will start a cleaning scheme to pull the mixed traffic of attack traffic and normal traffic through BGP, CDN, etc. Pull the mixed flow to the flow cleaning center for cleaning. The problem in the process of traffic cleaning is that the current DDOS attacks present a mixed attack state with multiple attack methods coexisting. In this case, how to efficiently detect attacks is the main problem currently facing. After consulting numerous data, Huawei's "seven-layer cleaning plan" is found to be very enlightening. The scheme comprehensively analyzes data packets for mixed traffic through seven layers of defense measures such as static filtering, abnormal message filtering, scanning and snooping message filtering, source legitimacy authentication, session-based prevention, feature identification filtering and traffic shaping, so as to detect attack traffic to the greatest extent. The framework of Huawei's "seven-layer cleaning scheme" is shown in Figure 2. After the traffic is cleaned, the attack traffic is discarded, and the normal traffic is injected back into the network through MPLS, GRE tunnel technology, etc.白猫不是猫，是一个丫头。/sniff (inhale)赵子儿和管夫人随即都露出满意的笑容，说道：汉王，您一路风尘，臣妾已经为您备好热汤，还是先沐浴吧。忽然想起选婿的事，便明白这些人是在相看她了。一个91岁的男子，被家人和朋友甚至他自己所遗忘，即将深深陷入孤独和痴呆。而在有机会短暂重获记忆时，格雷身上发生了巨大的转变，他要利用自己宝贵的清明时间去揭开侄子的死的谜题，以及接受自己的过去。