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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.杨长帆没有答话，转身往外走。今天，任我行、令狐冲、向问天当世三大高手对战东方不败，胜者生，败者死。Showtime喜剧《#单亲辣妈# SMILF》续订第二季，预定明年播出。On April 21, holding the attitude of testing, I made an appointment with my little partner to wear the product and went up the mountain, completing a total of 44.77 kilometers, lasting nearly 11 hours, with a cumulative altitude rise of 2823 meters.《偶像军团红了!她》是MBCEvery1的一档由当红组合主持的明星娱乐节目。每期都会邀请当红的偶像，大多为女生，偶有男生出席。如KARA、Joo、BabyVoxx、WonderGirls、FIsland、Jewelry。是啊。