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This section describes a variety of keyboard combinations that can be used in flight simulators. To enter flight simulator mode, press Ctrl + Alt + A (+ Option + A on the Mac). If you have entered the flight simulator mode for the first time, you can enter the mode again by selecting Tools > Enter the flight simulator. To exit flight simulator mode, click Exit flight simulator in the upper right corner, or press Ctrl + Alt + A (+ Option + A on Mac).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.气得板栗狠敲了黄豆脑门一下，怒道：几年没打你，你皮痒了是不是？一边扯着葫芦急急忙忙就出去了。鲁三哥挥手道：别说了，先去见小姐再说。Source. Method ();