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According to IDC's 1998 survey, the industries with high demand for IT personnel are: telecommunication, business services, medical care, retail and wholesale, and financial services. Compared with the technology industry, which employs purely technicians, it will come in a much wider range.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.-Tail lights, 3 nautical miles;Pppr=0x804850d洛奇·巴尔博，当年的重量级拳王，如今已经退休在家。老婆去世，儿子不在身边的他，孤零零地经营着一家小餐馆。距离他在拳坛的第一次登顶，几十年已经过去了，没有他身影的拳击台上，不少当年的手下败将开始耀武扬威，其中之一就是外号叫做“The Line”的梅森·迪克逊，他是新晋的重量级拳王。洛奇渴望再一次的战斗，却又畏惧于自己的年迈，直到一天他在电脑模拟拳击游戏中打败了梅森·迪克逊。当他看到屏幕上宣布洛奇·巴尔博是最终的胜利者那一刻，洛奇觉得自己心中的激情又重新燃起，他决定在真实生活中复出并挑战新拳王梅森。然而，复出生涯并本影片基于真实故事改编。在1986年挑战者号升空爆炸的前夕，一名工程师竭尽全力阻止飞船的发射。这位一腔热血的工程师争分多秒地争取中止这艘价值十亿美元的挑战者号飞船的发射，坚持认为O型密封环会故障失效并导致飞船全员覆灭。马歇尔太空飞行公司做出了商业层面的决策，而这位工程师做出了人性的抉择。