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Singleton is a common design pattern. In Java applications, a singleton object can ensure that only one instance of the object exists in a JVM. This model has several advantages: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.A suspicious employee of the movie is provided free of charge by Watermelon Cinema. Feature film a suspicious employee HD complete works are watched online, a suspicious employee high-definition complete version, complete works video, plot introduction, collection of classic lines, wonderful drama reviews, downloads, cast, roles, subtitles, posters, stills, theme songs, interludes, ending songs, pictures, opening, ending, trailer, trivia, etc. More "a suspicious employee" feature film information is all in watermelon cinema. What you are watching now is the feature film "A Suspicious Employee" starring Liu Shengfan allow Charge into Dongri. You may also like: Eight and a Half Women, Happy Neighbors, Endless, Blue Boudoir Surprises, Tom Jones.Episode 20她这便让几位组长坐下，拿出篮子里的工具，开始讲解风铃如何制作。　　物欲横流的时代，人们该如何面对曾经弥足珍贵的亲情、友情与爱情……Attack targets include: large amount of data operations, database access, large memory files, etc.