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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.Often when writing materials, we will inadvertently add many blank lines. How should we quickly sort out the documents and delete these redundant blank lines after finally writing them? Using the search and replacement function in Word can help us delete redundant blank lines with one click. After opening the replacement, we will look for the input "^ p ^ p" and replace it with "^ p" in the middle, and replace it all.杜宰相忙道：胡御史，皇上已经派人去府衙听审了，实情如何，稍后便知。少女梅苑怀孕了，为此，她与家人闹翻了。而恰恰在这时，恋人却失去了音讯。走投无路的梅苑只好辍学来到恋人工作的海滨城市，但任凭她怎么也找不到对方了。茫然中她失足掉进了公园的湖水中，一个正好路过的年青人把她救了上来，什么也没说就走了。公园的清洁工景姨收留了梅苑。救梅苑的人是谭小亮，他刚刚刑满释放。当年他为了得到一套梦寐以求的房子帮老板李春阳顶罪，出狱后才知道李春阳根本就没有履行诺言。谭小亮找到李春阳，却被李的手下人给赶了出来。他发誓一定要让李春阳付出代价。谭小亮迫于生计只好和朋友北毛一起干起了倒卖假证的活。地产商人邱志心的 21 大厦开张，李春阳不请自到。 21 大厦本来是李春阳的项目，却由于资金缺口被邱志心趁机拿走了。李春阳咽不下这口气。看到邱志心的妻子虞梦，李春阳动起了心思……郑氏微笑道：去就去吧。中年女医生高飞性格单纯，不谙处世之道，工作出色，家庭生活却一塌糊涂。第一次婚姻失败后，高飞费尽周折嫁给了乐观、踏实的大龄剩男黄成。然而，本想认真经营的第二次婚姻却再次面临危机。面对婆婆的百般刁难、丈夫的冷漠相对、复杂的家庭关系、父亲的突然出现、前夫的不断纠缠，同事的无端排挤，高飞的日子过的焦头烂额。好在每次困难时闺中密友沈心总能相伴左右。在沈心的支持下，高飞为捍卫她的第二次婚姻做出了种种笨拙的努力。跌跌撞撞中，高飞学会了宽容，珍惜生活，善待身边每一个人。神秘的全球性灾难爆发，一位独自驻扎北极的科学家竭力与一群返回地球的宇航员取得联系，他们正要回到惨遭神秘灾难重创的地球。