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Reset authentication takes advantage of the reliability of TCP protocol, and DDOS protection system responds to syn first. When the protective device receives syn, it responds to syn_ack and sets the Acknowledge number to a specific value (recorded as a cookie). When the real client receives this message and finds that the acknowledgement number is incorrect, it will send a reset message with a sequence number of cookie + 1. The source of the forgery will not have any response. In this way, we can add the real client IP to the white list. ?The factory class mode provides a mode to create a single class, while the builder mode is to centralize and manage various products to create composite objects. The so-called composite objects refer to a class with different attributes. In fact, the builder mode is obtained by combining the previous abstract factory mode with the final Test. Let's look at the code:Contracting anti-smuggling ships was a profession in those days. Some ship owners went to check fishing boats in the nearby waters and fined those found smuggling. After collecting the fines, they handed over some of them to the state and the rest were owned by the ship owners themselves. 　　林思明笑了笑：很简单。行动间，那腿脚还有些不利索，胡老大急忙上前搀扶。When making exposure compensation, if the photo is too dark, the exposure value should be increased. Every 1.0 increase in the exposure value is equivalent to doubling the amount of light ingested. If the photo is too bright, the exposure value should be reduced. Every 1.0 decrease in the exposure value is equivalent to doubling the amount of light ingested.Scarcity mentality will seriously affect cognitive judgment ability, and a sharp decline in cognitive judgment ability will lead to shortsightedness. In other words, a person will become stupid if he is poor.