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The SYN-Flood attack is currently the most common DDoS attack on the network, It is also the most classic denial of service attack. It takes advantage of a defect in the implementation of TCP protocol. By sending a large number of attack messages with forged source addresses to the ports where the network service is located, it may cause the half-open connection queue in the target server to be full, thus preventing other legitimate users from accessing. This kind of attack was discovered as early as 1996, but it still shows great vitality. Many operating systems, even firewalls and routers, cannot effectively defend against this kind of attack, and it is very difficult to trace it because it can easily forge the source address. Its packet characteristics are usually that the source sends a large number of SYN packets and lacks the last handshake ACK reply of the three handshakes.The pins on the PCB are dual-column or multi-column components and the layout direction of multiple discrete components regularly arranged should be as consistent as possible and toward the direction of the PCB under design in the production line, as shown in the following figure:《城市传说》原名《超能宝贝II》讲述地心超能力能源爆发，昏睡一年后的部分人类拥有了超能力，但没想到的是在超能力的背后竟然隐藏着一个即将毁灭地球的黑暗阴谋。与以往少儿电视剧不同的是，该剧将打破传统少儿电视剧制作理念，剧情设计偏向于成人化，力求培养观众的独立思维，提升观众及演员对亲情、友情的认知能力。接着又看礼单，跟小葱仔细斟酌了一会，方才定下了。爱卿在翰林院也有三年了，不妨出去历练一番，以备将来大用。杨长帆一拍大腿：这孙子真来挖我家墙角。