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The other two schemes are based on SYN cache and SYN? Cookies (see 6.4), simplifies the state initialized when the TCB is generated by receiving the SYN, and delays the instantiation of the full state [4]. In hosts that use SYN caching, a HASH tablespace with a limited size is used to store a subset of data that will be allocated to the TCB. If the ACK is received when the handshake is completed, the data will be copied into a complete TCB, otherwise HASH values exceeding the lifetime will be recycled when needed. In Lemon's FreeBSD, the SYN cache is 160 bytes for a half-open connection, while a full TCB is 736 bytes and supports 15,359 SYN cache spaces.Category division is specified through the Coding Matrix. There are many forms of coding matrix, the common ones are binary code and ternary code. The former specifies each class as a positive class and an inverse class respectively, while the latter can specify "disabled class" in addition to the positive and inverse classes. FIG. 3.5 shows a schematic diagram. In FIG. 3.5 (a), classifier f2 takes samples of Cl and C3 as positive examples and samples of C2 and C4 as counterexamples. In FIG. 3.5 (B), classifier f4 takes the samples of C1 and C4 as positive examples and the samples of C3 as counterexamples. In the decoding stage, the prediction results of each classifier are combined to form the code of the test example. The code is compared with the corresponding codes of various types, and the category corresponding to the code with the smallest distance is taken as the prediction result. For example, in Figure 3.5 (a), if based on the European distance, the prediction result will be C3.When the switch is pressed, the program will call the self.buttonWasPressed method. All behaviors after the switch is pressed will be encapsulated in this method. The code is as follows:此后，嘉夜又偶遇杜谦永的孪生弟弟，放浪不羁的杜谦龙的女儿向日葵（白鸟玉季）有男朋友！？龙的前舍弟？雅（志尊淳）就职活动！？龙所属的原天雀会的姐姐？在云雀的生日会上发生了意外！？等，6个暖烘烘的喜剧被展开。SNMP's amplification attack principle is similar to NTP's. This method mainly uses SNMPv1's Get request and SNMPv2's GetBulk request to amplify traffic.