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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.夺回关中只是第一步，将来何去何从才是关键。飞机失事，只有一名乘客奇迹般的存活，可是就在她快要在医院里康复之际，却隐隐感到了生命受到威胁。（観月ありさ、奥貫薫饰）两个小厮忙跟了上去。CBSAllAccess宣布续订《星际迷航：发现号》第四季,第四季的拍摄将于11月2日开始。Validator.add (registerForm.userName, [{strategy: 'isNotEmpty', errorMsg: 'User name cannot be empty'}, {strategy: 'min Length: 6', errorMsg: 'User name cannot be less than 6 bits long'}])　　爱必争