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First of all, the 10,000-hour exercise must be targeted, with feedback and correction, but it will become mechanical repetition. The seeds sown did not grow into towering trees, but only got a pile of weeds.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.…,叔叔，发生何事？项羽担忧地问道。Review norms and standards只是这时，张无忌也筋疲力尽。脑子还算灵活的哥哥X肢体还算灵活的弟弟！天底下居然还有这样的兄弟！哥哥世河（申河均饰）虽然头脑聪明，但没了弟弟东久（李光洙饰）便寸步难行，弟弟东久虽然游泳实力超群，但没了哥哥世河的加持就什么都做不了，二人虽然没有半点血缘关系，但也是共度了二十年的特级兄弟。这一天经营兄弟二人的安乐窝负责之家的神父去世，援助金中断供给，二人开始面临分道扬镳的危机。为了守住负责之家，和弟弟东久在一起，世河招揽区政府游泳池的兼职生美贤（李絮饰）当游泳教练，成功让东久进军游泳比赛，吸引了大众的视线。正当大家看到了希望之际，一个意料之外的人物出现在了兄弟二人的面前，让二人再次面临了全新的危机