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2传闻牧雄香织Sakagami Tamori象牙山村的成绩不太理想，徐支书很头疼。村民得知香秀和马忠经常吵架以为马忠欺负香秀了，受过长贵恩惠的徐支书听闻此事，带着村民找马忠评理。镇里觉得徐支书做法过激，撤掉他职务并委派一位“第一书记”主持村里工作。第一书记到来，做了三件事——An event can be active (open) or stopped (closed). Active means that the event scheduler checks whether the event action must be called. Stopping means that the declaration of the event is stored in the directory, but the scheduler does not check whether it should be called. After an event is created, it becomes active immediately, and an active event can be executed once or more times.For example, we often validate forms, such as the registration login dialog box. We need to validate before logging in: for example, there are the following logics: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.Obvious advantages of offline mechanisms:Disadvantages: Not fond of tidying up