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During the DNS NXDOMAIN Flood attack, multiple queries will be made to the DNS server, making the cache of the DNS server store the query results of the attacker, eventually causing the speed of DNS resolution requests of normal users to slow down.滨海S市，外籍华商麦先生来到律师事务所请求协助，S市最有名的律师（陈宝国饰）接手此案，经过艰苦的调查，发现有人利用麦先生的签名签下假合同，落入了一个精心布置的诈骗网。在调查过程中，陈宝国的女助手被他的才华所吸引，然而陈宝国已经是有妇之夫，两人间若有若无的情感陷入深深的矛盾之中……随着调查的深入，真相即将揭晓，一个组织严密的诈骗犯罪团伙渐渐浮出水面，而背后黑手正是官司商勾结下的市领导高官！就在此时，陈宝国遭遇追杀，报案外商麦先生的人身安全也遭到威胁，案件侦办因来自上级的压力而停滞，律师团队调查再次陷入僵局……他们从事着最令人羡慕但也危险的职业，他们为了维护天下的正义奉献自己的青春与生命。那一股浩然正气，在天地间长存，因为他们坚信，正义必将战胜邪恶！Now, let's imagine why these "checkpoints" are called "chains" in iptables. As we know, The purpose of a firewall is to match "rules" for passing messages, Then execute the corresponding Action, So, when the message passes through these checkpoints, You must match the rules on this level, However, there may be more than one rule on this level, But there are many rules, When we put these rules in a chain, A "chain" has been formed. Therefore, we imagine each "checkpoint" as shown in the following figure. In this way, it is more appropriate to call them "chain". Each message passing through this "checkpoint" must match all the rules on this "chain". If there are qualified rules, the corresponding actions of the rules will be executed.Public void notifyObservers ();沈悯芮瞪着眼道，《望夕图》怎么能给这号人？还挺讲究……杨长帆挠着下巴道，送点不疼不痒的东西倒也没什么。其实，这还不是最重要的。At this point, Zhao Mucheng was still as calm as at the beginning, holding the fishing rod firmly in his hand, repeatedly using "I don't remember" to resist the questioning of details, and did not see any resistance or irritability.