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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.哪里不同？公子是富甲一方。高兴被人误以为男生，她的爸爸是咖啡师，十年前去世，留下一本工作多年写的咖啡日记。高兴的梦想是继承父业，做一名出色的咖啡师。可爸爸去世后，高兴和妹妹、妈妈相依为命,过着拮据的生活。为了还债，失业的高兴来到家附近新开业的王子咖啡店应聘，老板姜尚武要开一家特色咖啡馆，因此她不能公开自己是女生的事实，没想到竟然和霸道总裁姜尚武从欢喜冤家变成朋友。与此同时她还结识了姜尚武的堂哥秦哲默，秦哲默是白鹿咖啡馆温文尔雅的暖男总裁，却因女友韩笑的离开而痛苦，韩笑回国求复合，高兴为秦哲默出谋划策，排解烦恼。高兴与姜尚武、韩笑与秦哲默，两对有情人经历了情感纠结和事业的起落后都有所成长，高兴还通过自己的努力终于成为了咖啡师。谢谢大家。杨长帆继而问道，第二种呢，埋在地下的大黄豆你可曾见过？未曾见过，但听过，也是很矮的，可以在很贫瘠的地方生长的东西，花虽然很好看，但是叶子很难吃，根确实很大。该剧将讲述高丽人奇子敖的女儿在家人被高丽王杀害后，以高丽贡女的身份被进献给元廷，通过一系列宫廷权利斗争，从身份低微的掌茶宫女，最终成为元朝皇后的故事。