试题1

嗅探器可以使网络接口处于杂收模式，在这种模式下，网络接口 （ ） 。
A、只能够响应与本地网络接口硬件地址相匹配的数据帧
B、只能够响应本网段的广播数据帧
C、只能响应组播信息
D、能够响应流经网络接口的所有数据帧

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试题2

The traditional way of allocating a single channel among multiple competing users is to chop up its (1) by using one of the multiplexing schemes such as FDM (Frequency
Division Multiplexing). If there are N users, the bandwidth is divided into N equal-sized portions, with each user being assigned one portion. Since each user has a private frequency (2), there is no interference among users.When there is only a small and constant number of users, each of which has a steady stream or a heavy load of (3), this division is a simple and efficient allocation mechanism. A wireless example is FM radio stations. Each station gets a portion of the FM band and uses it most of the time to broadcast its signal.However, when the number of senders is large and varying or the traffic is (4), FDM presents some problems. If the spectrum is cut up into N regions while fewer than N users are currently interested in communicating, a large piece of valuable spectrum will be wasted. If more than N users want to communicate, some of them will be denied (5) for lack of bandwidth.„„
（1）A.capability   
B.capacity   
C.ability  
D.power
（2）A.band   
B.range  
C.domain   
D.assignment
（3）A.traffic   
B.date   
C.bursty  
D.flow
（4）A.continuous   
B.steady   
C.bursty   
D.flow
（5）A.allowance  
B.connection   
C.percussion  
D.percussion

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试题3

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试题4

（ ） 无法有效防御DDoS攻击。
A、根据IP地址对数据包进行过滤
B、为系统访问提供更高级别的身份认证
C、安装防病毒软件
D、使用工具软件检测不正常的高流量

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试题5

RIP协议中可以使用多种方法防止路由循环，在以下选项中不属于这些方法的是  ( )  。
A、垂直翻转
B、水平分割
C、反向路由中毒
D、设置最大度量值

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试题6

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试题7

Linux系统中，下列关于文件管理命令cp与mv说法正确的是　（ ）　。
A、没有区别
B、mv操作不增加文件个数
C、cp操作不增加文件个数
D、mv操作不删除原有文件

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试题8

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试题9

默认情况下，Linux系统中用户登录密码信息存放在  ( )  文件中。
A、/etc/group
B、/etc/userinfo
C、/etc/shadow
D、/etc/profile

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试题10

软件产品的可靠度并不取决于  ( )
A、潜在错误的数量
B、潜在错误的位置
C、软件产品的使用方法
D、软件产品的开发方式

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