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The foundation of SYN flooding attack is the design of three-way handshake when TCP is used to establish connection. The third packet verifies that the connection initiator has the ability to accept the packet at the source IP address used in the first request, that is, its return is reachable. Figure 1 shows the process of exchanging packets at the beginning of a normal TCP connection.At present, there are three main strategies to defend against CSRF attacks: validating the HTTP Referer field; Add token to the request address and verify it; Customize and validate properties in HTTP headers.《紧急救命》第二季再开。上一季着重讲他们各自的成长，而到了第二季则更多的讲到了医患关系，经历了不少生离死别和无能为力后，成为医生的初衷是否能经受的住现实的打击，且他们对“医生”一词又有了新的认识。西柏坡，中国北方一个普通的小山村。在太行上的臂弯里，她面朝着滹沱河，流连着一缕静静的蓝色。　　对越自卫反击战打响了，志南义无返顾地回到部队。莉莉鸿雁传书、苦苦等候的结果却是志南牺牲的噩耗。海青很快从悲痛中自拔，乔娅则与新欢打的火热，只有莉莉痛不欲生。海涛默默地陪伴在莉莉身边，极尽抚慰，莉莉被海涛的万般柔情所感动，准备接受他的爱。"Deliberate Choice"