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1. Written examination:In TCP protocol, messages arriving at the destination will enter the buffer of the TCP stack and will not be forwarded to the receiving system until the buffer is full. This is to minimize the number of times the system empties the buffer. However, the sender can force the receiving system to clear the contents of the buffer by sending a TCP message with a PSH flag of 1. The TCP PUSH + ACK attack, like the TCP SYN attack, aims to deplete the resources of the victim system. When an attacker sends TCP messages with PSH and ACK flags set to 1 to the Target host, these messages will cause the Target system to clear all TCP buffers (whether the buffers are full or not) and respond with an acknowledgement message. If this process is performed by a large number of controlled hosts, the system will not be able to process normal data, resulting in denial of service.Wobany introduces several classic methods here to detect the advantages and disadvantages of network cables.A total of 4,215 Memcached reflection servers that have been used to launch attacks in the past two months are still active this month, of which 2,718 are located within China and 1,497 are located outside China. According to the statistics of provinces, Guangdong Province accounts for the largest proportion, accounting for 18.7%, followed by Beijing, Zhejiang Province and Shandong Province, of the Memcached reflection servers that have been continuously used to launch attacks in the past two months. According to the statistics of operators or cloud service providers, Telecom accounts for the largest proportion, accounting for 30.5%, Aliyun 28.0%, Unicom 14.3% and Mobile 11.1%, as shown in Figure 8.Delete the rule according to the rule sequence number, delete the specified rule of the specified chain of the specified table, and the-D option means delete the rule in the corresponding chain.