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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.他笑道：如何用功的？还不是跟平常人一样读书。As far as a class is concerned, there should be only one reason for it to change. If a class assumes too many responsibilities, it is tantamount to coupling these responsibilities together. Changes in one responsibility may affect other responsibilities. In addition, coupling multiple responsibilities together will also affect reusability.百姓们都想要尽快躲到楚军身后去，争先空号，毫无秩序，谁都不愿先让开，山谷之中严重堵塞。Even newcomers who have never used this software can successfully own DAEMON as long as they carefully read the pop-up prompt and continue.