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.
BIM technology has changed the traditional modeling thinking, realized the technological innovation of three-dimensional to multi-dimensional information modeling, and truly realized collaborative design. Through the promotion and application of technology, it has become an effective auxiliary tool for owners in the decision-making stage, and the necessary ability for design and construction units to undertake large projects. At present, foreign scholars pay more attention to the interdisciplinary and cross-domain comprehensive application of BIM technology to realize overall management in various aspects and to realize all-round cooperative work in various construction stages, various specialties and during operation. At present, foreign BIM technology is mainly applied to construction, design and operation management in subway.
少年杨家将的故事以杨家将归宋为起点。北汉被灭后，遗臣杨业为宋太宗器重赏识，杨业为了苍生福祉，以及报答太宗的知遇之恩，带领七子效忠宋室，力抗辽军入侵，写下名扬天下的忠义史话。
而后者，《天书红颜录》既然采取免费形式，就不会再在线下弄什么收藏版、纪念版。
在残酷的现实面前，一雪前耻成为了一件渺茫的事情。
"It's also our little Charlie's credit!"
工体摇曳的霓虹夜色，一群不甘寂寞的青年男女：辛小野、苏小暖以及夏泽成、于左左、钱碎碎、海歌、米粒、戴飞等身份各异的人，因为一场宿醉而彼此纠葛，这种纠葛由酒精催化，也因酒精而升华，彼此在最后都收获了一份感动和认知的爱情故事。
改头换面的云修隐姓埋名，决心向谢颐复仇，封景（徐海乔 饰）成为了他的经纪人。在封景的运筹帷幄之下，云修和名为褚风（苏航 饰）的练习生组成了搭档，并且凭借着一部超人气偶像剧一夜成名。褚风并没有表面看上去的那么单纯善良，只是这一次，云修不会再被表象蒙蔽。在漫长而又艰辛的复仇之路上，云修起起落落，既有春风得意的无限风光，亦有失魂落魄的谷底时光，但是云修知道，自己一定要珍惜的，是那个无论风风雨雨都一直陪伴在身边的她。
1940年5月，在墨西哥城郊区，一支穿着警察打扮的墨西哥共产党士兵袭击了俄国革命前领导人Leon Trotsky的住宅。一刻钟，他们向房子开枪，但令人难以置信的巧合是，托洛茨基和他的妻子幸存下来。在斯大林十一年的驱逐中失去了几乎所有的亲人，托洛茨基明白：他永远的敌人，他将继续追捕他直到他生命的结束。逃跑是可能的，但不是逃避。托洛茨基决定战斗。但他的武器不是子弹，而是文字。他想留下一份政治遗嘱，第一次完整而真诚地讲述一个犹太年轻人如何成为新世界的先知并摧毁最大的帝国。为了写回忆录，他邀请了他的思想对手——一位同情斯大林的加拿大记者——把他转变成他的信仰，这样他就可以改造整个人类…
通过讲述程鹿、程鹿未婚妻阿娣、程鹿生死兄弟警察杨成忠、杨成忠第二任妻子白珍四人之间的爱恨情仇，探讨在利益、情感的交错下人性的复杂与阴暗，人与人之间的信任与怀疑，描绘出一场现代股市大战背下警与匪、爱与恨、利益与人性重重内幕交错的精彩故事。
明明想往前划的，结果那船头却拐来拐去，甚至于窜出了水道，划到旁边水道去了。
Molten is a Japanese brand, not a Chinese brand, but the ball is very good.
这是什么鬼？面目全非脚？我去。
DDoS attacks can be divided into many different forms. These forms include flood attacks and more sophisticated application layer attack methods/tools. Flood attacks rely on a large amount of traffic/sessions to deplete a target, such as TCP SYN, ICMP, and UDP floods; Advanced application layer attack methods/tools include Slowloris, KillApache, etc.
郑氏道：那你们往后就给我使劲打。
蓝马、艾婷、李健雯与邵芳岚四人本为杀人无数之罪犯，经改造后，分别加入中、港、台秘密国防组织，从事特务工作。中国接获线报，一干部欲将火箭零件卖给恐布分子作军事用途，遂派遣岚侦查。其它三名特务分别授命加入抢夺，过程中一香港市民被害，香港警方展开侦查，遂引发中、港、台三方的连环追逐。
她虽然也识得几个字，却不敢当二位‘大智慧的评价。
他南征北战，武功就不说了——再强也是人力有限，但他对危险的超常敏锐感知，却不是一般人能比的。
这是一个发生在传奇城市深圳(北上广的缩影)关于爱情与梦想的故事。 也是一个关于现实与奋斗的故事，更是一个关于欲望与救赎的故事。 一路上他们憧憬过，感叹过，他们也曾豪情万丈，也曾伤痕累累。太多欢笑酸，在这里持续上演......
I. Classification of Design Patterns
