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20If 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.刘邦这么一说，刘邦的神色顿时有些不自然了，说的一点都不错，确实如此。If onTouchEvent () returns false when the child view does not consume the event, then the event is passed back to its parent view's onTouchEvent (), and if the parent view does not consume the event, it is finally passed back to Activity for processing.We can see above that the basic process of Baidu's interview is like the above code, so Ali and Tencent's are also similar to the above code (here we don't stick the same code one by one), so we can extract the public code. Let's first define a class called InterviewSkating