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The SYN-Flood attack is currently the most common DDoS attack on the network, It is also the most classic denial of service attack. It takes advantage of a defect in the implementation of TCP protocol. By sending a large number of attack messages with forged source addresses to the ports where the network service is located, it may cause the half-open connection queue in the target server to be full, thus preventing other legitimate users from accessing. This kind of attack was discovered as early as 1996, but it still shows great vitality. Many operating systems, even firewalls and routers, cannot effectively defend against this kind of attack, and it is very difficult to trace it because it can easily forge the source address. Its packet characteristics are usually that the source sends a large number of SYN packets and lacks the last handshake ACK reply of the three handshakes.少女时代泰妍将担任预计今年上半年播出的女团回归大战Mnet《Queendom 2》的主持人。In addition, if you are familiar with JavaScript, you can write your own script to border photos, which is quite convenient.A rich man wanted to help a poor man become rich. That winter, he gave him a cow: "If you use the cow well, you will be able to get rid of poverty in autumn." The poor began to struggle with hope.2. The structure of the smoke bomb also has great filtering effect on tar and is healthy by going up one flight of stairs.「童谣」在日本已经有一百多年历史，家喻户晓的儿歌《同行歌》和《花一匁》，其实是在日本明治开国年间把《蜜蜂做工》等德国儿歌翻译成了日语进行传唱。诞生百年纪念电影《这条路》。A complete computer system consists of hardware and software. As the name implies, hardware is the physical equipment that can be seen and touched in the computer, such as the host computer. Software, on the other hand, is relative to hardware. It refers to various programs and related documents needed to run on the computer, such as a drawing software or a gobang game. Computer hardware and software are indispensable. Hardware is the material basis on which software can work and is the "body". Software is the soul of the computer and the core of controlling and operating the computer. They complement each other and form a complete computer system. From the appearance, the computer includes: monitor, host computer, keyboard, mouse and sound box.