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That is to say, a total of false syn messages will occupy the TCP preparation queue for 63s, while the semi-connected queue defaults to 1024, which is different by system default and can be viewed by cat/proc/sys/net/ipv4/tcp_max_syn_backlog c. That is to say, sending 200 fake syn packets per second without any protection is enough to burst the semi-connection queue, thus preventing the real connection from being established and responding to normal requests. The end result is that the server has no time to ignore the normal connection request-denial of service.Fingers slide on the screen3.1(3) When all the Concrete Event Handlers are registered, the application will call the handle_events method to start the event loop of the Initiation Dispatcher. This is where the Initiation Dispatcher merges the handles of each registered Concrete Event Handler and synchronizes the occurrence of blocked waiting events using the Synchronous Event Demultiplexer. For example, the TCP protocol layer uses the select synchronization event splitter operation to wait for the data sent by the client to reach the connected socket handler.The setting of the application of the startup mode of the activity is related to its development scenario. There are basically two situations for opening a new activity in the App:同时心中也颇为惊奇，这大火燃的竟如此之快，定是风助火势吧。