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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.跨过门槛，满屋老小个个喜气盈腮。Walk 200 kilometers along the border to another village. There was a Kirgiz grandfather who told me that it was not enough to walk along the border to protect the border.最明显的，是他们没有那份慌张无措，更多的，身上都带着一种煞气，还有吊儿郎当的痞气。When do we use modular mode?一九五零年初春，人民解放军解放了成都，国民党史伪政权即将土崩瓦解。别的时代遭遇着一番传奇的命运。 　　故事以王保长与三嫂子三次圆房，三次失败；三次上山为匪，又三次起义，直至生擒蒋县长，立下大功的经历为线索，艺术的再现了“旧社会把人变成狗，新社会把狗变成人”的深刻道理。喜剧性的展示了人性的丰富和多采。故事结尾的神来之笔，又给全剧抹上了一层淡淡的忧伤，浓浓的惆怅……