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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.-Deng Bin (Initiator of Book Sharing)Netfilter is the real security framework for firewalls. Netfilter is located in kernel space.而高中入学前的两个人——伊理户水斗和绫井结女以意想不到的形式重逢。HBO续订《硅谷》三季。由年轻喜剧演员与老牌明星联合主演，《硅谷》叙说着一位住在“骇客旅社”的内向电脑工程师与他朋友们的故事。这群不太能融入社会的家伙被一位网路公司的百万富翁“关照”着，他允许这群工程师免费住在他的房子，不过条件是要取得他们专案的10%股份。　　经过生离死别瞬间的两人，感情愈发亲厚。可是国家政变，父亲被囚，Napatsorn的公主身份终于揭开，NamChiew震惊不已，原以为只是富家小姐，没想到竟然是尊贵显赫的公主！他知道两个人的爱情注定是一曲悲歌，可是他仍毅然协助深爱的她复国，为的只是能好好珍惜两人弥足珍贵的短暂爱情，哪怕牺牲生命也在....改编自德国畅销小说。一名年轻女子克拉拉，因为男友过世无法走出伤痛，于是一直传简讯给他，未料男友的手机号码，已被一名体育记者马克在使用。两人就在阴错阳差的世界裡，开始产生了交会…