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In order to use SYN? Cookies to calculate the SYN-ACK serial number (that is, SYN? Cookies), the host must first combine some local password bits, a data structure including IP address and TCP port number, SYN initial sequence number, and some index data identifying the password bits. An MD5 digest is generated on top of all the above bytes, and then some bits are truncated from the hash value to put it into the SYN-ACK sequence number. Since the size of the sequence number is about a quarter of the total hash value, this truncation is necessary, but usually at least 3 bytes of hash bits are used for verification, which means that there are still nearly 2 24 possibilities to guess and verify cookies without knowing the password bits. In order to send out the hash value, some bits of cookies will reduce the upper limit value of MSS (Maximum Segment Length) contained in SYN and affect the index bits that identify the native password bits in the hash value.It is an improvement on the common factory method mode. In the common factory method mode, if the passed string is wrong, the object cannot be created correctly, while multiple factory method modes provide multiple factory methods to create objects separately. Diagram:然终因范睢谗言，被秦王赐死。王尚书立即问：张离，你有何话说？大苞谷走近白凡，盯着他的眼睛，幽幽道：不管你装得如何君子，我知道你是什么样的人。本剧基于真实事件、2004年法国纪录片《楼梯悬案》、书籍《Written in Blood》等素材创作而成。故事将探索Michael Peterson的生活，他那位于北卡罗来纳州的大家庭，以及他妻子Kathleen Peterson十分可疑的死亡。又用心，晓得自己动手试。