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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.11. Return to a previous step if necessary.隋末，瓦岗寨义军的营外忽然有人要与罗义认亲，罗义拒认，反诬是杨林派来的奸细。程咬金察出其中必有蹊跷，亲往南营视察。姜桂枝终于说出原委。原来，四十年前，罗艺赶考途中发病，被河南南阳姜家集员外带回家中调养，其女姜桂枝一见倾心，在父母应允下，与罗艺结为夫妻。后来，由于战乱，夫妻分离。罗艺因战功卓著成为隋朝大将，并另娶妻生子罗成。程咬金巧妙安排，使罗艺亲自出战，大败姜桂枝的花枪之下。罗艺理屈词穷，只得认错，结发夫妻重新团圆。Snow Mountain Flying Fox: Sword [Skill Damage] +30%.　　7. Hail Britpop!Lin Dashao is the first of the "Yanjing Four Shaos" and is nicknamed "Entertainment Circle Face-beating Crazy".Droplet theory: Reduce the melting temperature, form droplets and leave the combustion system.