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Because some denial of service attacks take advantage of the vulnerabilities of network protocols, others seize the limited processing capacity of the network or equipment, the prevention and treatment of denial of service attacks has become a headache for administrators. In particular, firewalls, load balancing and other equipment, which are widely used on the backbone lines in most network environments, often become the bottleneck of the whole network when DDoS attacks occur, causing the paralysis of the whole network.渔民们用珊瑚石建房子和院墙，打鱼采珠为生。两边早有番邑守军开路，让出宽阔的大道来。Amazon拿下Jenny Han的YA小说《我变美的那夏天 The Summer I Turned Pretty》（《致所有我曾爱过的男孩 To All the Boys I've Loved Before》作者的另一作品）改编权，并准备弄成一部8集剧，作者本人会负责首集剧本。　　备将他们秘密接回秦国，恢复他们已经渐被人们遗忘了的秦国太子妃与长公子的身份。3. ITunes will start automatically at this time and prompt you to resume the mode (iPhone will always remain black). Then you can hold down the shift key on the keyboard, click "Recover" and select the corresponding firmware to restore.Now let's make some improvements and go directly to the code: