(66) program propagates itself by modifying other programs to include a possibly changed copy of itself and that is executed whe

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问题 (66) program propagates itself by modifying other programs to include a possibly changed copy of itself and that is executed when the infected program is(67). A virus often causes damage or annoyance and may be triggered by some event such as the occurrence of a predetermined date.Worm is a self-contained program that can propagate itself through data processing systems or computer networks. Worms are often designed by hackers to use up(68) resources such as storage space or processing time.Trojan horse implies by the name an apparently harmless program containing(69) logic that allows the unauthorized collection, falsification or destruction of data. Logic bomb causes damage to a data processing system when triggered by some specific system condition. Time bomb is also a malicious program being activated at a(70) time.

选项 A、predefined
B、predetermined
C、predicted
D、pmscheduled

答案B

解析 病毒程序通过修改其他程序,使之纳入其可能已更改的副本,以此传播自身,而受传染的程序被启用时即予执行。病毒经常造成某种损坏或困扰,并可由某一事件(例如某一预定日期的出现)触发。蠕虫是一种自足式程序,能通过数据处理系统或计算机网络传播自身。黑客经常设计这类蠕虫去耗尽可用资源——例如存储空间或处理时间。特洛伊木马,顾名思义,是指一种表面无害却包含恶意逻辑的程序,使其能未经授权即汇集、伪造或破坏数据。逻辑炸弹当由某一特定的系统条件触发时,造成对数据处理系统的损害。定时炸弹也是一种恶意程序,在预先确定的时刻被激活。
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