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On the one hand, the core components of the network infrastructure have never changed in the past ten years, which makes some discovered and exploited vulnerabilities and some mature attack tools have a long life cycle and are still valid even today. On the other hand, the rapid development of the application of the Internet seven-layer model has diversified the attack targets of DDoS. From the web to DNS, from the three-layer network to the seven-layer application, from the protocol stack to the application App, the endless new products have also given hackers more opportunities and breakthrough points. Moreover, DDoS protection is a project with unequal technology and cost. Often, the construction cost of a business's DDoS defense system is larger than the cost or benefit of the business itself, which makes many start-up companies or small Internet companies unwilling to make more investment.面色冷若寒冰，颤颤巍巍地抬起手，指着章平。小葱见他们尴尬的模样，扑哧一声笑了，心里却暖暖的。就连关中以北那以黄土著称的高原，在那个时候是相当的水草丰美。柯南立刻利用追踪眼镜的望远镜功能，沿着弹道发现了一个黑色的身影。“从那么远的距离进行狙击，怎么可能？！”柯南马上与女高中生侦探世良真纯乘坐摩托车追赶逃走的狙击手，意想不到的是狙击手居然连警察的巡逻车都打算一起炸掉，整个追踪过程都被其玩弄于股掌之中。结果，这场激烈的追踪将FBI也卷入其中，犯人以及狙击事件的谜团都消失在了大海里。最后，还是希望天启能改正，虽然已经晚了，但是总比一直执迷不悟的强。