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The real limiting factor for a single attacker who uses spoofing attacks is that if these spoofed packets can be traced back to their real addresses in some way, the attacker will be simply defeated. Although the backtracking process requires some time and cooperation between ISPs, it is not impossible. However, it will be more difficult to prevent distributed SYN flooding attacks launched by attackers using the advantage of the number of hosts in the network. As shown in FIG. 3, these host groups can use direct attacks or further let each host use spoofing attacks.Thank you for the special tip of Popular Science:郑氏命板栗将戏班子里用不着的人都拉出去，在后园子里搭了戏台，开锣唱起戏来。张良道：问题正在这里。田大志是一家设计公司的普通员工，土木工程专业毕业的他却做着公司最底层的活：送水、修水电、修空调……还经常受到同事的排挤。有一天，他因意外受到刚上任的美女老板的赏识，被调到设计部，频频被美女老板关照。正当他以为会和美女老板开始一段情缘的时候，却发现美女老板欺骗了他……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.世界变成了汽车人、霸天虎和Alpha Q军团争夺能量晶体的战场。