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It is still Simon, who believes that human "bounded rationality" is embodied in learning as "situational rationality"-learning wherever it is used. People's learning is restricted or promoted by situations. What you want to learn will be applied in what situation, then you should learn these things in what situation. For example, if you want to learn programming, you should learn it in GitHub, because you will program through GitHub in the future. For another example, if you want to learn bargaining skills, you should learn them in actual sales situations, because this skill is ultimately used in sales situations.Core Module? It is the modules provided in the API of Node.js standard, such as fs, http, net, etc. These are all modules officially provided by Node.js, compiled into binary codes, and the core modules can be directly obtained through require, such as require ('fs'). The core modules have the highest loading priority. If there is a naming conflict between the modules and the core modules, Node.js will always load the core modules. ?Charming Vietnam 20171108 Episode 2要是练霓裳能原谅卓一航，那我以后就是天启一生黑。　　然而洪兴社团的众人已经按捺不住躁动。人人自危的情势开始：分管不同领域的华超（吴镇宇饰）、黎继祥（曾志伟饰）、钟孝礼（张智霖饰）、游志标（陈小春饰）几人当中，有的已经被警方掌握了犯罪证据，有的正陷入一场恐慌，看不清身边谁人是卧底身份。警方铲除洪兴社团即日可待。Iptables are more complicated and I am not very good at using them. It has certain influence on server performance and cannot prevent large-scale attacks.According to the above introduction, DDoS attacks need to obtain a large number of broilers, but it is becoming more and more difficult to obtain broilers. Is there any way to attack a large number of broilers without controlling broilers? DRDoS (Distributed Reflection Denial of Service), an attacker will not send the request directly to the attacker, but will send it to a third party through which to transfer it to the attacker, which is the embodiment of "Reflection". Its process is as follows: the attacker tampers the source IP of the request packet with the IP to be attacked, and the target IP is the third-party IP, then the target IP of the third-party recovery message becomes the IP of the attacker, thus the attacker will receive a large number of requests and the service is unavailable.