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There are three kinds of factory modes: simple factory mode, factory method mode and abstract factory mode. All three solve one problem, that is, the creation of objects. Their duty is to separate the creation of objects from the use of objects.　　错综复杂的生活，变　　该剧将以雨贤为中心描写网络购物的现况。The reason for terminal management is mainly aimed at two aspects: 1. The weak security awareness of employees leads to terminal attacks, even internal and external network interoperability, service and OA interoperability, etc. The problem may not be found in a short period of time. When viruses and Trojans enter, the damage caused is not only a terminal or a small OA area, but also the network environment of the whole group. 2. Employee insiders, the so-called "thousands of guards and thousands of guards" are difficult to prevent. It does not rule out that employees who are resentful will copy enterprise information through terminals and conduct covert online transactions.According to statistics, SYN attack is the most common and easily used attack method among all hacker attacks. I believe many people still remember the attack on YAHOO website in 2000. At that time, hackers used simple and effective SYN attacks. Some network worms cooperated with SYN attacks to cause greater damage. This paper introduces the basic principle, tools and detection methods of SYN attack, and comprehensively discusses the prevention technology of SYN attack.为了摘掉可以看得到鬼神的眼睛，于是赚钱抓鬼的驱魔师朴奉八与因为没能参加高考而遗憾死去的女高中生金贤智同甘共苦一起追击鬼的喜剧故事。