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Copper-clad epoxy glass cloth laminates for printed circuits遭遇车祸的小欣伤愈后回到家中，却对以前的事失去了记忆，但不时地心中模糊地会想到一个人，那个人到底是谁？小欣为什么会念念不忘？铁力帮助村民建板房、建临时学校，柳曼设立心理诊疗所。村民吴小凤教其他人画绢画，借此抚平心灵创伤。中央公布了十八个省市对口支援地震灾区计划。阿四小皮笑脸地调笑着。胡宗宪重又提起纸笔。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.In the above figure, using the-A option, It means "adding rules" in the corresponding chain, and-A means append, so-A INPUT means adding rules in the INPUT chain, while the-I option used in the previous example means "inserting rules" in the chain. As you must understand, their original intention is to add a rule, but-A means adding rules at the end of the chain, and-I means inserting rules at the beginning of the chain.