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如何作战完全由自己看着办，汉王可以说将巴蜀全权委任给自己。Class has only one instance. Q: How can we guarantee it? Answer: Private constructors are used to ensure that classes cannot be instantiated outside the class.3. Each receiver knows only one other object, that is, its successor in the chain.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.观众和媒体对于本季的关注，几乎全都放在Morgan Jones（Lennie James）这个角色身上——毕竟这个角色起到桥接该剧和母剧《行尸走肉》（The Walking Dead）的重要作用，也是《行尸走肉》和《行尸危途》开播以来第一次出现情节交叉的情况。因为《行尸危途》的故事时间要比《行尸走肉》早很多，因此观众在《行尸危途》中看到的Morgan是「过去的Morgan」——《行尸走肉》首集中的Morgan，甚至更早。在遇到Rick等人之前，Morgan有过另外的朋友、另外的敌人和另外的威胁。第四季的故事地点主要设定在德州，故事时间可能会发生一定幅度的时间跳跃。Alicia Clark、Victor Strand和Luciana Galvez都还活着。其中Luciana已经消失了很长一段时间（这是第三季Luciana中途离开后我们第一次见到这个角色），她如何回归、如何找到Alicia和Strand都耐人寻味。Madison Clarke和Nick也仍然是核心角色。除了这五位，其他回归角色的身份本季都可能发生变化（有些不再是常规角色，有些大幅减少了戏份，有些干脆不再出现）。除了Morgan之外，本季还新增了多个重要角色：Jenna Elfman扮演生存者Naomi，在僵尸末日时代完全有能力独自生活——事实上她已经独自生活很长时间了。当她遇到Madison及其家人后，自然而然地保持着高度戒心。随着剧情发展，观众会发现她为什么对人总是冷冰冰的，为什么与别人保持距离。即便如此，她还是与某些角色（特别是Alicia）产生了某种共鸣，这让她自己都感觉惊讶。她有时给人幽默的感觉，有时又给人轻浮的感觉。Maggie Grace扮演生存者Althea，她看起来就像是《行尸走肉》中的Maggie。她在僵尸末日时代的生存技能，很大程度上来源于僵尸危机爆发前积累的经验。她携带了一些令人印象深刻的武器，好奇心很强，而且善于理解别人，这给了她战术优势。Althea从来不相信「不劳而获之利益」，只相信自己的艰苦奋斗。她有一个坚定的目标，Strand似乎对这个目标颇感兴趣。Evan Gamble扮演多集角色Ennis，一个缺陷明显、外表凌乱的男人，他永远都只关心自己。Kevin Zegers扮演一个神秘角色。正所谓穷则思变，眼前的人们，不穷了。