【名词&注释】
恶意代码(malicious code)、拒绝服务(denial of service)、木马程序(trojan horse program)、端口号(port number)、逻辑表达式(logic expression)、“特洛伊木马”
[单选题]通过替换系统的合法程序，或者在合法程序中插入恶意代码，以实现非授权进程，从而达到某种特定目的。
A. 窃听
B. 拒绝服务
C. 假冒
D. 特洛伊木马
查看答案&解析
举一反三：
[单选题]put computers to practical business use, but below the surface it is the heart of an(22) - the kernel - that provides the technical wizardry to juggle multiple programs, connect to networks and store(23).A traditional kernel provides all the functions for applications. The kernel(24) memory, I/O devices and parcels out processor time.The kernel also supports(25) and fault tolerance, which is the ability to recover automatically when parts of the system fail.
A. Databases
B. Applications
C. Drivers
D. Games
[多选题]与A+A·B等价的逻辑表达式(logic expression)是______。(?、+、·分别表示逻辑异或、逻辑加、逻辑乘)
A. A+B
B. A+B
C. A?B
D. A·B
F.
[单选题]●在Internet中，WWW服务的TCP标准端口号是 (28) 。(28)
A. 50
B. 60
C. 70
D. 80
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