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Italy: 650,000SYN 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.讲述一个年轻的克拉克·肯特在超人生涯早期的故事。关于这部电影的更多细节没有透露。田遥跟他比，稍显傲气了些。他们的努力都激起了同事们的斗志，在管教学生方面也颇有成效，全校上下合作一条心。没想到，学校将要关闭的消息传来了……“这是一部讲述新中国成立前，新闻从业人士化笔为枪，与日伪汉奸及国民政府的腐败进行不懈斗争的电视剧。 　　这是一部生动刻画一对恋人生死相爱，而女主人公范晓芸（万茜饰）为执行地下党交付的任务，一次次抛离爱人，身背汉奸骂名，打入日伪机关而不能明言，生离死别，苦不堪言的爱情苦旅的故事。” 　　这是一部围绕记者冷言（李光洁饰）身陷阴谋，不能自拔，苦苦寻求真相而不断撞击日伪汉奸的诡计，屡遭追杀的悬疑剧。