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SYN attack is a kind of DOS attack. It takes advantage of TCP protocol defects and consumes CPU and memory resources by sending a large number of semi-connection requests. SYN attacks can not only affect hosts, but also harm network systems such as routers and firewalls. In fact, SYN attacks can be implemented as long as these systems turn on TCP services no matter what systems are targeted. As can be seen from the above figure, the server receives the connection request (syn=j), adds this information to the unconnected queue, and sends the request packet to the client (syn=k, ack=j+1), then enters the SYN_RECV state. When the server does not receive an acknowledgement packet from the client, it retransmits the request packet and does not delete this entry from the non-connection queue until the timeout. With IP spoofing, SYN attacks can achieve good results, Typically, clients forge a large number of non-existent IP addresses in a short period of time, SYN packets are continuously sent to the server, and the server replies to the confirmation packets and waits for the confirmation of the customer. Since the source address does not exist, the server needs to continuously resend until it timeout. These forged SYN packets will occupy the unconnected queue for a long time, normal SYN requests will be discarded, the target system will run slowly, and in serious cases, the network will be blocked or even the system will be paralyzed.黄衫女子飘然而至，出招攻向周芷若。Article 28 [If the circumstances are minor] Under any of the following circumstances, the medical security administrative department shall give a warning interview, causing losses to the medical security fund, and shall order it to return to the medical security fund and impose a fine of twice the illegal amount:《决胜荒野》是一档真实的野外生存竞技节目，不仅展现了探险家们面临的艰难险境，还突显了生存专家在竞技压力下的个人特技。本季《决胜荒野之华夏秘境》除了维持上一季精良的国际制作、紧张刺激的竞赛节奏以外，更是将赛场搬到了中国，来自全球顶级的生存专家，将在这片充满东方色彩的土地上展开优胜角逐。本季节目的竞赛场景主要集中在中国的陕西、甘肃、四川、云南、广东等地，这些地区以多样的地理环境、独特的自然资源而闻名。从宣传片中可以看到，德爷的挑战将在连绵险峻的群山天坑、寸步难行的雪地冰川、万里无边的沙漠沼泽、暗含危机的海洋岛屿，同时还有极端恶劣的天气和生存环境等情况下进行，所到之处风景壮丽但又处处暗含危机。究竟谁才是野外生存领域的王者，让我们拭目以待吧！Step 4: Final Implementation Means　　《陌路惊笑》概念海报Article 13 Those who have been engaged in maintenance and testing of fire-fighting facilities and fire safety assessment activities for more than three years before the implementation of these Provisions and meet the qualification conditions stipulated in Articles 9 and 11 of these Provisions (except for the working time of secondary qualification) may apply for temporary primary qualification within six months from the date of implementation of these Provisions.