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The main reason why DDOS attacks are difficult to defend is that there are too many vulnerabilities and attack methods that can be exploited. In the OSI seven-layer network model used in the network data transmission process, basically each layer has protocols that can be exploited by DDOS attacks. According to the different network levels of the protocols used for DDOS attacks, this paper summarizes the currently known DDOS attack types and their defense measures as shown in Table 1-3. For more detailed information on current DDOS attack and defense, please refer to Huawei DDOS attack and defense summary post.Console.log ("Baidu's human resources are too weak, I am waiting for flowers are thanks! ! ");221. X.X.8故事发生在1947年的天津卫。郑心凌（路晨 饰）是富商之女，平日衣食无忧过着公主般的生活。怎奈天有不测风云，母亲突遇车祸身亡，心凌深受打击，不久竟患上抑郁症。宁雅（冯波 饰）是一名留洋归国的心理医生，他问诊后把心凌带到一处幽静山庄进行治疗。9.1. 1 Peptic ulcer is qualified after being cured.　　所以当日许鞍华找她演出桃姐一角时，她一看剧本便被感动起来，并说：“能和华仔再次合作真的太好，虽然是很久之前的事，也好像