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DDoS attacks can be divided into heavy traffic attacks, TCP state exhaustion attacks or application layer attacks. In Kapersky's DDoS Attack Report published in the second quarter of 2011, HTTP flood attack is the most common DDoS method, which is an example of application layer attack. The dominance of application layer attacks reflects that the rapidly evolving DDoS has broken away from the traditional direction of large traffic attacks.Director: Chen Hengxu (When Spring Blooms/Good Woman Red in the Day)所以，陈启把苏樱提前到第八集出场。那样越国的损失可就严重了，尤其是民众的安全感和对自己的信心，这将很不利于自己未来的发展。自此精修，渐进于无剑胜有剑之境。Take synkill. Exe as an example. Run the tool, select the random source address and source port, fill in the target machine address and TCP port, activate the operation, and soon find that the target system is running slowly. If the attack effect is not obvious, it may be that the target machine does not open the filled TCP port or the firewall denies access to the port. At this time, you can select the TCP port that is allowed to access. Generally, Windows systems open ports tcp139 and UNIX systems open ports tcp7, 21, 23, etc.