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The reason is, first, its durability needs to be repaired by 800 ~ ~ ~, which can fully meet our needs.掌柜的颓然闭嘴。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.大家都觉得你清楚。When your Apple device has a software failure and cannot start normally, for example, problems such as forgetting our device startup password can be solved through DFU mode recovery. The steps to enter DFU mode are as follows: