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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.那他为何这般笃定呢？似乎只能归结为神乎其神的直觉？但是次数多了，还能称之为直觉吗？陈平总觉得尹旭有种神乎其神的未卜先知的能耐。　　十六个小故事有神奇，有烦恼，有笑声，有感动，对爱情的向外，对亲情的追忆，对人生的徘徊，对未来的恐惧，构成了一幅咸鱼和rose生命多种可能性的美丽画卷，犹如人生百味，柴米油盐酱醋茶，酸甜苦辣咸，喜怒哀乐怨。人生总是在希望中面临困惑走向绝望，又从绝望中坚强不息走向希望，故事中咸鱼和rose心底善良，拼搏向上，于人生困境中搏出一片青天，体验了生命的各种美好，传递了人生应该坚持希望，积极向上拥抱美好的乐观精神，表达了生命不止，自强不息的内涵思想。The green arrow at the bottom indicates that it can be passed. Some ticket gates are two-way. When someone comes towards him, the green arrow will turn into a red fork.让爹想吧。