4. SingleInstance
The SYN-Flood attack is currently the most common DDoS attack on the network, It is also the most classic denial of service attack. It takes advantage of a defect in the implementation of TCP protocol. By sending a large number of attack messages with forged source addresses to the ports where the network service is located, it may cause the half-open connection queue in the target server to be full, thus preventing other legitimate users from accessing. This kind of attack was discovered as early as 1996, but it still shows great vitality. Many operating systems, even firewalls and routers, cannot effectively defend against this kind of attack, and it is very difficult to trace it because it can easily forge the source address. Its packet characteristics are usually that the source sends a large number of SYN packets and lacks the last handshake ACK reply of the three handshakes.
《回归》：90年代，儿子举家移民，孙女却因学业暂时留在香港爷爷家。爷孙两人隔代沟通，妙趣横生。在生活中消解代沟，隔阂打破，亲情更上一层楼。
一群义警准备扳倒滥用超能力的腐败的超级英雄们。
Launching reflective attacks requires finding a large number of transmitters on the Internet. Some kinds of reflective attacks are not difficult to implement. For example, for ACK reflective attacks, only servers with open TCP ports on the Internet need to be found, and the existence of such servers on the Internet is very extensive.
In the termination phase of tcp connection, the connection between the client and the server is usually cut off through four interactions of messages with fin flags. However, when one of the clients or servers has abnormal conditions and cannot normally complete four tcp waves to terminate the connection, RST messages will be used to forcibly interrupt the connection.
是大龄青年的小伟和水仙张罗各自终身大事，可是花开花落，云起云飞，总难见到好事成双，客栈的生意
秦枫板脸不语，令学徒重新帮胡镇上药包扎。
先什么都不要说，好不好？红椒转脸，看着他激动的神情，心中隐隐作痛。
Return collection.get (pos);
从东边绕到西楚国后背，两边夹击，或许汉国独力就可以灭亡西楚国。
中年女医生高飞性格单纯，不谙处世之道，工作出色，家庭生活却一塌糊涂。第一次婚姻失败后，高飞费尽周折嫁给了乐观、踏实的大龄剩男黄成。然而，本想认真经营的第二次婚姻却再次面临危机。面对婆婆的百般刁难、丈夫的冷漠相对、复杂的家庭关系、父亲的突然出现、前夫的不断纠缠，同事的无端排挤，高飞的日子过的焦头烂额。好在每次困难时闺中密友沈心总能相伴左右。在沈心的支持下，高飞为捍卫她的第二次婚姻做出了种种笨拙的努力。跌跌撞撞中，高飞学会了宽容，珍惜生活，善待身边每一个人。
System.out.println ("after proxy! ");
实实在在的剑术，最近才向项庄请教学习呢？让人家姑娘请教我剑术？不是误人子弟吗？虞妙弋淡淡一笑，说道：嗯，不过项籍大哥已经答应教我剑术了，不可以再另他人为师了。
Add the following code to "TestSpring":
差役尴尬道，可这在定员之内。
At present, many products are doing this, not to mention commenting on what is worth buying Little Red Riding Book. Even Meituan, a platform with preferential strategy, is trying to make content. For example, the movie highlights of Cat's Eye movies and the "How to Play for Two Days and One Night" of Meituan's tour are consumption decisions.
进入王宫大殿，一个年轻潇洒的身影站起来，朗声笑道：郦先生远道而来，越国上下蓬荜生辉啊。
