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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.《天河魔剑录》电视剧成本高达四亿，平均一集电视剧接近七百万，无论导演、演员、摄影、服饰、道具什么的，都是最好的，《天河魔剑录》电视剧播放出来，也证明了对得起这样的拍摄成本，这部剧的确武侠剧史上最好的武侠剧。How to enter DFU mode:The photo pro of Huawei's mobile phone,几个姐妹正在小屋内享受假期时却遭到了几个戴着面具的闯入者的袭击，她们必须奋力一战才能活过这一夜。