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When the client SYN packet arrives at the filter gateway, the SYN agent does not forward the SYN packet, but actively replies the SYN/ACK packet to the client in the name of the server. If the client's ACK packet is received, it indicates that this is normal access. At this time, the firewall sends the ACK packet to the server and completes three handshakes. The SYN agent actually replaces the server to deal with SYN attacks. At this time, the filter gateway itself is required to have strong ability to prevent SYN attacks.From the above command class code, we can see that any operation has an execute method to perform the operation. The above code uses traditional object-oriented programming to implement the command mode. The procedural request call of the command mode is encapsulated in the execute method of the command object. Have we found the above writing code a little cumbersome? We can do this using the callback functions in javascript, In object-oriented, The receiver of the command mode is saved as an attribute of the command object, and the command execution operation is agreed to call the command.execute method. However, if we use the callback function, then the receiver is closed in the environment where the callback function is generated, and the execution operation will be simpler. Only the callback function can be executed. Let's look at the following code:　　在险象环生的斗智斗勇中，原本一心为财的马天明被革命者蔡里昆的高风亮节所打动，真正成长为一个深晓民族大义的共产党人，最终战胜了恶徒，完成了组织交予的任务，同时也为自己洗清了冤屈。林成洲大学毕业，只身来到这座陌生的城市，已经两年了。《傲慢与偏见与僵尸》的作者是塞斯·格拉汉姆-史密斯（Seth Graham-Smith），他沿用奥斯汀的故事设定和语言风格，讲述了伊丽莎白·班纳特所在的小镇降临了一场瘟疫，很多人都变成了僵尸，伊丽莎白立志要把僵尸全部消灭掉，然而傲慢无礼的达西先生的到来，打乱了她的计划，经过一番斗嘴和好，两人开始携起手来对付僵尸，最终拯救了小镇。