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Then enter PU in the CAD command bar to clean up all the layers and blocks, and then confirm. Repeated inspection and cleaning, be sure to see the number of layers to a minimum.DDoS attacks can be divided into heavy traffic attacks, TCP state exhaustion attacks or application layer attacks. In Kapersky's DDoS Attack Report published in the second quarter of 2011, HTTP flood attack is the most common DDoS method, which is an example of application layer attack. The dominance of application layer attacks reflects that the rapidly evolving DDoS has broken away from the traditional direction of large traffic attacks.将他们的表演升华为娱乐，翻滚的舞台演出和大胆无畏的摄影工作。6? Countermeasures of Network Terminals只有抓到刘邦，将他杀死，此战就能大获全胜，以后也能少许多的忧虑和灾祸。OCP (Open-Closed Principle) principle emphasizes that a software entity (class, function, module, etc.) should be open to extension and closed to modification. That is, every time there is a change, the behavior of the existing type should be enhanced by adding new code instead of modifying the original code.