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3.1It can be used to divide namespaces and reduce the number of global variables.Data processing attack我那年帮了玉米弟弟一回，也就给他吃了几口玉米糊糊，买了几个馒头，又没帮什么忙。If an attacker sends SYN packets quickly with their own undisguised IP address, this is a so-called direct attack. This attack is very easy to implement because it does not involve spoofing or modifying packets below the user layer of the attacker's operating system. For example, he can simply send many TCP connection requests to implement this attack. However, for this attack to work, the attacker must also prevent his system from responding to SYN-ACK packets because of any ACK, RST, or ICMP (Internet? Control? Message? Protocol) will cause the server to skip the SYN-RECEIVED state (go to the next state) and remove the TCB (because the connection has been successfully established or recycled). Attackers can do this by setting firewall rules, causing the firewall to block all packets (except SYN) to reach the server, or causing the firewall to block all incoming packets so that SYN-ACK packets are discarded before reaching the local TCP handler.他们每日除了处理好自己分内事情之外，就是前来和越王商议军情。剑气纵横，光芒耀眼，剑花朵朵，犹如黑夜繁星，千点万点，遍空飞洒。