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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.这部动画片的主角是小幻和冲冲。冲冲和小幻简直就像是海绵宝宝的陆地版本，他们古灵精怪，他们友谊深厚，这一种欢快动画片值得一看。洪霖点头不语，半响才道：不过是桃花，这清南村到处都是，也不是什么稀罕物。该季于2017年10月12日在美国CW电视网首播。He said that hundreds of people come here every day and want to go upstairs and have a look. They have locked up the rooftop.这是一个关于一个叫Kenny Stanford的年轻人的故事，他曾梦想成为音乐界的成功艺术家，但这些梦想被打断了。　　任务迫在眉睫，危急时刻，打入保密局内部的“鲨鱼”不得不冒死现身，目共两党展开了前所未有的情报斗争、隐蔽斗争……