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TCB (TCP? Transport Control Block is a transport protocol data structure that contains all the information of the connection (in fact, in many operating systems, it is a queue used to process inbound connection requests. The queue holds TCP connection items that are in a half-open state and items that have established a full connection but have not yet been extracted by the application through an accept () call). The amount of memory occupied by a single TCB depends on the implementation of TCP options and other functions used in the connection. Usually a TCB has at least 280 bytes, which in some operating systems has exceeded 1300 bytes. The SYN-RECEIVED state of TCP is used to indicate that the connection is only half open, and the legality of the request is still questioned. An important aspect worth noting here is that the size of TCB allocation space depends on the SYN packets received-before the connection is fully established or the return reachability of the connection initiator is verified.Second, the main differences between the two are as follows:夜幕降临，小镇寂静祥和。不知从哪个角落，传来了倒计时的声音。少女璐娜跪坐在黑漆漆的房间内，头上戴着一个宇航员头盔，眼睛紧盯着电视屏幕中火箭发射直播。她对航空航天格外着迷，身为修鞋匠的父亲投其所好，连女儿的生日都专门特制了一双航天靴。父女俩志趣相投，共同朝着航天梦而努力。璐娜一天天长大，她的航天梦从未消失。她努力学习，刻苦训练，小有成就，却也遭受了更多的挫折。Statement of Rights:二姐姐的精气神就没人能比，正所谓‘人比花娇。15年前，在农场溺水的小陶斯被小瑞瑞所救，两个孩子来到了星苹果树下许下心愿：祈求两人能早日遇到生命中的真爱与幸福。但就在小陶斯还来不及询问小女孩的姓名便与她匆匆失散，时间一下子过了15年……