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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.小淘气一家又回归了！在新一部电影里，Spanky, Alfalfa, Darla, Buckwheat, Petey小狗一众的各种恶行充满欢乐！这次，小淘气们不惜一切要拯救奶奶的面包店。唯一问题是，他们向来都是成事不足，败事有余！无论是糟糕的宠物美容或是计程车服务，他们一分钱也挣不到。他们唯一的希望就是赢得社区天才表演比赛的奖金了。可是，你有听过Alfafa唱歌吗？玛赛拉第三季……庆幸的是，这些人都在睡着。该剧讲述了金时空终极一班的雷婷、止戈和金宝三到银时空出任务的过程中意外砸伤了刘备（止戈银时空的分身），从而导致止戈和刘备互换身份的一系列故事。　　《Visible: Out on Television》定于2020年2月14日在Apple TV +上首播。