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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.姨娘一定乐开花了吧。　　·在电影上映前后，有好几本名为《快乐的大脚2》的文学作品要出版。有些的故事情节与电影情节相符，有些则不是。周菡又结巴了，好容易才转过脑筋道：是我爹，他听张子易大人说的。六十年代初、中期，北方大学以宋朝、伍岩松为首的一大批研究生、本科生，在我国著名空气动力学家、国防部专家组副组长郭庄教授的推荐下，一夜之间，从校园里消失。来到荒凉的河滩上，接受了国家赋予他们的历史使命：为共和国设计建造急需用于飞机、导弹、火箭等尖端武器研制的风洞。/frown