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目前的Ｉｎｔｅｒｎｅｔ网络对拒绝服务（Ｄｅｎｉａｌ ｏｆＳｅｒｖｉｃｅ， ＤＯＳ）攻击的抵抗力很有限，这种攻击将使合法的用户无法正常使用网络和服务，这种威胁甚至影响到了Ｉｎｔｅｒｎｅｔ的发展。拒绝服务有三种常见的攻击方式，它们是：服务过载、消息流和信号接地
The current Internet has very limited resistance to Denial of Service (DOS) attacks, which will disqualify legitimate users from using networks and services. This threat even affects the Internet. Denial of service There are three common ways to attack, they are: service overload, message flow and signal ground