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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.一个江湖女骗子一夜之间从灰姑娘变身为豪门少奶奶，却遇上对自己展开八颗牙齿笑容攻势的小傻子。然而繁花落尽，苦尽甘来之后才回首醒悟，原来小骗子和小傻子的缘分，早在年少两小无猜时就已种下。That kind of tacit understanding and comfort众人正诧异，就见他俩三两下将外面的小袄儿扒了下来，跟着又把裤子也脱了，只剩下里面的小衣裳，伶伶俐俐跟个猴儿似的，一抬手，露出藕节似的小胳膊。Iterator patterns are created for collection objects, For collection objects, It must involve the addition and deletion of collection elements, and certainly supports the operation of traversing collection elements. If the traversal operation is also placed in the collection object at this time, the collection object will bear too many responsibilities. At this time, the responsibilities can be separated and the traversal of the collection can be placed in another object, which is the iterator object.尤其是近来一段的时，子房先生满脑子全是如何保住刘邦。这样的电影即使连续看上十遍八遍，也依然会爆笑不止，不会觉得乏味。