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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.在下好歹也曾经是‘神童，也蒙皇上隆恩。皇帝开口问道：玄武侯，白虎将军这两个弟弟……板栗忙道：老二叫郑昃，小名黄瓜。叶青青不间断的噩梦，刑司羽和秦云的暧昧鬼祟，深夜别墅踢踏的高跟鞋声音，半透明窗外小女孩贴近的笑脸……一桩桩诡秘事件的发生，将度假别墅变成了一座阴森的囚笼。而此时，叶青青的油画却进行得异常顺利。邓草草的世界随着孩子的走失而崩溃，她离了婚，怀着对孩子的愧疚和对自己的不原谅独自生活。龚剑也是离过婚的大龄单身男，原是部队特种兵，退伍后在一家大型安保公司做保安队长，负责的正是邓草草住的小区。机缘之下，龚剑和邓草草相遇相识。邓草草几年来一直锲而不舍地找她的孩子，龚剑帮了不少忙。孩子找到时已经不是当年那个乖巧懂事的小孩，自称土蛋，上天下地无所不能；龚剑和这个极尽顽劣的土蛋建立起既斗争又合作，非父子似父子的特殊感情。于是按部就班走进婚姻程序的龚剑、邓草草开始互见长辈，龚剑的母亲王彩琴竟然是邓草草当年雇佣的保姆、前夫关皓又回来找邓草草要求复婚、龚剑的女同事对他展开疯狂追求，龚剑和邓草草在婚姻的路途上磕磕绊绊。经历过重重的爱恨抉择之后，一次偶然的机会，龚剑和邓草草再次走到了一起！