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First of all, it needs an industry or field that has been reasonably developed. The routine of the whole industry has been clearly and deeply believed that if people cannot practice deliberately in the field of crossing the river by touching stones, blind guidance will easily occur. Without objective evaluation criteria, it is difficult to carry out deliberate practice. Gardening, chefs, consultants, teachers... cannot carry out deliberate practice.(3-1) X 3杨长帆笑道，要不等吃完饭，咱们到书房慢慢讲？成。Step 4: Low costDDoS 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.The rules for PREROUTING can exist in: raw table, mangle table, nat table.