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The main reason why DDOS attacks are difficult to defend is that there are too many vulnerabilities and attack methods that can be exploited. In the OSI seven-layer network model used in the network data transmission process, basically each layer has protocols that can be exploited by DDOS attacks. According to the different network levels of the protocols used for DDOS attacks, this paper summarizes the currently known DDOS attack types and their defense measures as shown in Table 1-3. For more detailed information on current DDOS attack and defense, please refer to Huawei DDOS attack and defense summary post.红椒等人还没觉察出二人异样，对郑氏道：娘，外婆和表嫂都来了。Fire emergencyCattle-solving by skilled workers: equipped with kitchen knives, total damage * (1 +0.5).虽然是警戒的未来，但是从正直的直斗的话中得到了勇气，踏上了天神路上的演唱会。之后，直斗开始了只有SNS的对话，即使见不到也会慢慢被吸引，与成长的未来直斗。虽然未来会变得积极，但前男友再次威胁…鲜为人知的贩毒手段，震憾惊人警匪交锋场面，首次披露尸体运毒骇人内幕。The read function we constructed has three parameters, which are different from the return address of the read function. The return address is popped out of the stack when the ret instruction is executed, but these three parameters are still in the stack and have not been popped out of the stack. This time, the execution of the next function system we constructed is affected, so we need to find an instruction with three consecutive pops to balance the stack. This kind of instruction is easy to find, as follows: