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Therefore, to sum up the distinguishing methods, the two main differences are:李敬文满意地笑了，一气把剩下的饭菜吃完。The third handshake: the client receives the SYN + ACK packet from the server and sends the confirmation packet ACK (ack=k+1) to the server. After the packet is sent, the client and the server enter the ESTABLISHED state and complete the three handshakes.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.Let's get rid of the control. It should be similar to the confrontational tank.就在张雷和周同前往订婚宴的路上，在一座桥下，两辆车停在了那里，直觉告诉张雷可能会有事发生，果然发生了枪战，张磊和周同立刻下车表明警察身份，就在这时，其中一个人对周同开了一枪，张雷也被车撞晕。等张雷在医院中醒来，才得知周同被枪击后抢救无效死亡。张雷看着痛哭的妹妹，悲痛万分。