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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.讲述因为罹患过剩记忆症候群而把一年365天8760小时的全部都记忆下来的男人，以及忘却了人生的重要时间的女人，带着同样伤痛的两人命运般地邂逅后相爱的故事。然而，白凡那边缺少证据审不下去，他只得将童侍郎先拎了出来。　　无耻之徒第四季定于明年初回归。神偷仇亦森在十年前盗出一对印制美金的模板，旋即遭女友章曼莉出卖，入狱十年，但唯一知道该模板下落的只有仇亦森一人。见赵锋眼光刀子一样剜过来，老鳖心里打鼓，急忙道：我先不是这么说的……不待老鳖说完，秦淼忽然脆生生地说道：你先说，蝉儿师妹是葫芦哥哥的媳妇。NTP (Network Time Protocol) is a common protocol used to provide time synchronization services. It is a typical UDP-based protocol, which is quite old and did not consider authentication in the original design, so it is an ideal hacker to use.