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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.30越狱是由福克斯公司出品的，桑福德-布克斯塔弗导演的美国电视连续剧，该剧由温特沃思·米勒和多米尼克·珀塞尔等人主演，共4季，于2005年8月起上映，讲述的是一个关于拯救的故事。　　小“恐龙妹”乔治娅（乔治娅·格洛梅饰）养了一只名叫安格斯的疯狂滑稽的猫，还有一对古怪的父母和一个常在她的床上撒尿的三岁小妹妹，她最好的死党杰丝（艾莉诺·汤姆金森饰）竟然爱上了水果店老板的儿子.......As mentioned above, SYN attacks can be prevented by increasing the backlog queue. In addition, reducing timeout time also enables the system to process more SYN requests. We know that the timeout timeout, that is, the half-connection lifetime, is the sum of the timeout times that the system waits for all retransmissions. The larger this value, the longer the half-connection takes up the backlog queue and the fewer SYN requests the system can handle. In order to shorten the timeout time, it can be realized by shortening the retransmission timeout time (usually the first retransmission timeout time) and reducing the number of retransmissions.那才是用兵的最高境界。The group of the dead.