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If a service needs to be public-oriented, it needs to provide a user access interface. These interfaces just give hackers the opportunity to take advantage of them. For example, the TCP/IP protocol handshake defect can be used to consume the link resources of the server, The stateless mechanism of UDP protocol can be used to forge a large number of UDP data packets to block communication channels... It can be said that the world of the Internet has not lacked attack points exploited by DDoS since its birth, from TCP/IP protocol mechanism to CC, DNS and NTP reflection attacks, and what's more, it uses various application vulnerabilities to launch more advanced and accurate attacks."Do you remember what type of explosive cylinder your company commander used at that time?" I asked.In 2013, investment in shrimps was 70,000 yuan, 30,000 yuan in loach, ricefield eel, snail feed, etc., 15,000 yuan in labor, 7,000 yuan in digging two ponds, 23,000 yuan in net gear and living expenses, etc., totaling 145,000 yuan. In 2013, it sold about 25,000 yuan of shrimps, miscellaneous fish and so on, and lost 120,000 yuan in 2013.宇航员项少龙在“星云”号事故中，遭遇黑洞，穿越回到2000多年前战国时代的中国，秦王嬴政登基前三年的赵国邯郸。项少龙孤身流落邯郸，为了可以回到未来，他决定不顾一切找到嬴政，助其建立一番伟大功业，从此开始了他寻找秦始皇的历程。途中，他不仅卷入质子回秦和各国权臣阴谋诡计中，并偶遇古代少女星云，在战国时代书写一段传奇。辛普森一家是来自美国普通的五口之家，荷马（丹•卡斯泰兰尼塔 Dan Castellaneta 配音）是春田镇核能工厂的安全检查员，母亲马芝（朱莉•卡夫娜 Julie Kavner 配音）曾经是一个很有思想的女性，自从嫁给荷马后渐渐地适应了主妇生活的定式。巴特（南茜•卡特莱特 Nancy Cartwright 配音）是家中的长子，天性顽皮的巴特经常爱玩一些恶作剧，以至于经常惹麻烦。妹妹丽莎（雅德丽•史密斯 Yeardley Smith 配音）是一个很聪明的孩子，同时还是素食主义者，佛教徒，爵士乐。小女马姬是一个永远长不大的孩子。故事设定于虚构小镇春田镇，从许多角度对美国的文化与社会、人的条件和电视本身进行了幽默的嘲讽，经久不衰。DDoS Attack and Defense: From Principle to Practice (Ⅱ)