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呵呵，按照大少爷话说，这是海妃在说话。The length of training depends on the profession you intend to enter. Usually, the key step you plan to start your IT career is to choose a school-depending on the length of school study-which is generally not very long. You don't need to go to college for 4 years or night school for 2 years. In fact, you will get certification within 6 months, which will make you face many job opportunities. Of course, it is full-time study. Rome was not built in one day. Although six months is not very long, it is enough for a person who plans to switch to IT.张杨对南瓜道：去，到门口瞧瞧你大哥回来没有。电视剧《致命名单》以一份国民党遗失的暗杀名单所展开，讲述了北原国民党保密局情报站欧阳站长深夜被人刺杀在办公室，一份牵扯到埋伏在延安所有的国民党特务和一个暗杀共产党重要首长的计划名单莫名遗失，引起国共两党高层震动！同时发下最高指令，不惜一切代价得到这份致命名单的故事。In other words, a SYN packet with only 40 bytes takes up 84 bytes of bandwidth when transmitted on the network.DDOS attacks mainly occur in the network layer. Its most obvious characteristic is to send a large number of attack packets, consume network bandwidth resources and affect normal users' access. At present, the detection and defense technology for DDOS attacks in the network layer is quite mature, and at the same time, some new attack methods-DDOS attacks in the application layer have emerged. Different from network layer DDOS attacks, application layer DDOS attacks mostly imitate the access behavior of legitimate users and will not generate a large number of attack data packets during data transmission, but they will consume server resources through a large number of database queries and other operations, which is more difficult to detect. According to the different attack modes, DDOS attacks include reflection amplification attacks in addition to ordinary flooding attacks. This type of attack often uses a legitimate server as a reflector, which sends a large number of data packets to the target, thus causing greater harm. At present, DDOS attacks against DNS servers are also common. Attackers often send fake domain names to DNS servers, consuming DNS server resources. At the same time, due to the recursive query mechanism in DNS servers, DDOS attacks against DNS servers have a large impact range.