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The "Regulations" are characterized by a wide range of uses and no strict restrictions on the status of the formulation and promulgation agencies. The matters and problems involved are not as important as those in the regulations, and the scope is relatively narrow. The content is detailed and specific, with strong pertinence; Generally, it is not only an "independent" normative document, It can also be a "supplementary" normative document (the content is to supplement the content of other normative documents according to law or authorization, and to refine and perfect them), It can also be "implemented" normative documents (it is directly formulated for the effective implementation of other normative documents, and does not create new rules by itself, but only makes specific provisions on the circumstances under which these documents are applicable, and makes detailed explanations on relevant concepts and issues). However, judging from the actual usage, the regulations are more suitable as "independent" and "supplementary" normative documents.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.讲述奥斯曼帝国的创始人奥斯曼一世的故事。红椒接过那小小的茶盏，咕咚咕咚两大口就喝完了。黄豆听青山说棉鞋有些夹脚，急忙凑过去道：那就给我穿，我脚没小叔那么长。……没时间了啊兄弟。　　牛郎是刘老儿家的二儿子