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三姐张水儿，二哥张坎……玉米眨巴着眼睛，掰着小手指努力记，记了这个忘了那个。Generally speaking, classifiers will face two kinds of antagonistic inputs sooner or later: mutation input, which is a variant of known attacks specially designed to avoid classifiers; Zero-day input, which has never been seen before the payload. Let's explore each antagonistic input in turn.If an attacker sends SYN packets quickly with their own undisguised IP address, this is a so-called direct attack. This attack is very easy to implement because it does not involve spoofing or modifying packets below the user layer of the attacker's operating system. For example, he can simply send many TCP connection requests to implement this attack. However, for this attack to work, the attacker must also prevent his system from responding to SYN-ACK packets because of any ACK, RST, or ICMP (Internet? Control? Message? Protocol) will cause the server to skip the SYN-RECEIVED state (go to the next state) and remove the TCB (because the connection has been successfully established or recycled). Attackers can do this by setting firewall rules, causing the firewall to block all packets (except SYN) to reach the server, or causing the firewall to block all incoming packets so that SYN-ACK packets are discarded before reaching the local TCP handler.法国的动画米拉小姐——Mila Raconte: Mille et une Histoires特七这才想起来手上拎着铁链，憨憨一笑，三两下绑了何永强手脚，随后又将其拎起，算你命好。承接第一部剧情，一群食肉老鼠通过水管道再次来袭，恐怖鼠患围攻家园。This kind of story and details are everywhere in this book. Historians know that the modern history of China is a dry fact, and the aspects provided by Aban, from the unique perspective of American journalists, are fresh and juicy, and are not well known to us or common to us, thus filling in the gaps, providing references and making history fuller and more complete.