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The opposite is the product certificate and basic information.然后自己展开另外一床被子，在床外铺开，准备躺下。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.The overview of Web security that I shared not long ago has received extensive attention, which shows that everyone is still very concerned about Web security. Therefore, Muke will introduce common Web attack methods and corresponding prevention strategies one after another. This issue introduces DoS and its family.励志青年徐泽使用虚拟现实技术创业,沉浸在虚拟世界中的徐泽迷茫而躁动,美丽的甜甜接近徐泽,要骗取他价值不菲的虚拟货币。徐泽的真诚感动了滑向犯罪深渊的甜甜,也挽救了他们的爱情,他们携手一起投身于社会公益事业。李敬文看着红罗巾覆盖的新人，心中十分柔软，迎上去低笑道：多谢娘子体恤。