For example, in the simplest case, network sniffing is used to obtain passwords, and those passwords are then used to mount an application-level attack.
例如，在最简单的情况中，网络嗅探能够用于获取密码，然后这些密码可以用于进行应用级攻击。
By these data pretreatment process, greatly improved the ability of distinguish application-level attack such as R2L, U2R attacks, intrusion detection system's performance was rised.
通过这些数据预处理过程，大大提高了入侵检测系统对于应用层攻击如r2l、U 2r等模式攻击的识别能力，提高了入侵检测系统的性能。
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