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3.3 For example, create a table to record the name and event stamp of each event schedule.The above configuration process takes only one time, and then you can happily use the service iptables save command to save iptables rules in centos7.C老者摇头道：别人也许是乱说，但许负姑娘所言本君相信。TCP works in the Transport layer, IP in the Network layer, and ARP in the DataLink layer; The data on the second layer is called Frame, the data on the third layer is called Packet, and the data on the fourth layer is called Segment. At the same time, we need to simply know that when data is sent from the application layer, header information will be added to each layer, encapsulated, and then sent to the data receiving end. This basic process you need to know, that is, every data will go through the process of data encapsulation and unencapsulation.What is then implemented isMonitoring generally refers to the construction of SOC security operation center and establishes a complete log system. Here, if you have money, you recommend SOC from large manufacturers. If you have no money, you use OSSIM or ELK (the author has not built it yet, so you will not make any unnecessary descriptions). As for some foreign products. If you can, you can't, because after-sales is very uncomfortable, really.