信息系统复习参考7(4)

C) peer-to-peer network.

D) wide area network. --WAN Answer: D Diff: 1 Page Ref: 254 AACSB: Use of IT CASE: Comprehension Objective: 7.2

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39) _ Cell phones work by using radio waves to communicate with radio antennas placed within adjacent geographic areas.

通过使用无线电波与相邻地理区域内的无线电天线通信进行工作。 A) Cell phones B) Microwaves C) Satellites D) WANs Answer: A Diff: 1 Page Ref: 257 AACSB: Use of IT CASE: Comprehension Objective: 7.2

40) Bandwidth is the

A) number of frequencies that can be broadcast through a medium. B) number of cycles per second that can be sent through a medium.

C) difference between the highest and lowest frequencies that can be accommodated on a single channel.

D) total number of bytes that can be sent through a medium per second. 带宽是

a) 可以通过媒体广播的频率数。 B) 每秒可通过介质发送的周期数。

C) 可在单个通道上容纳的最高和最低频率之间的差异。 D) 每秒可通过媒体发送的总字节数。 Answer: C Diff: 2 Page Ref: 257 AACSB: Use of IT CASE: Comprehension Objective: 7.2

41) The total amount of digital information that can be transmitted through any telecommunications medium is measured in 可透过任何电讯媒介传送的数字资料总额, 以 A) bps。单位UNIT B) 赫兹。 C) 波特。

D) gigaflops。 A) bps. B) Hertz. C) baud. D) gigaflops. Answer: A Diff: 2 Page Ref: 257 AACSB: Use of IT CASE: Comprehension

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Objective: 7.2

42) Digital subscriber lines 数字用户线路

A) 使用现有电话线进行语音、数据和视频的操作。

A) operate over existing telephone lines to carry voice, data, and video. B) operate over coaxial lines to deliver Internet access.

C) are very-high-speed data lines typically leased from long-distance telephone companies. D) have up to twenty-four 64-Kbps channels. Answer: A Diff: 2 Page Ref: 258 AACSB: Use of IT CASE: Comprehension Objective: 7.2

43) T lines

A) operate over existing telephone lines to carry voice, data, and video. B) operate over coaxial lines to deliver Internet access.

C) are high-speed, leased data lines providing guaranteed service levels. C) 是高速、租用的数据线, 提供保证的服务水平。 D) have up to twenty-four 64-Kbps channels. Answer: C Diff: 2 Page Ref: 258 AACSB: Use of IT CASE: Comprehension Objective: 7.2

44) Which protocol is the Internet based on? 哪一种协议是基于互联网的？ A) TCP/IP B) FTP

C) packet-switching D) HTTP Answer: A Diff: 1 Page Ref: 258 AACSB: Use of IT CASE: Comprehension Objective: 7.3

45) Which of the following is not an advantage of using VOIP?

A) VOIP can reduce a firm's communication costs by 20 to 30 percent. B) It allows e-mail and voice mail to be combined into a single directory. C) It enables the creation of two distinct networks for voice and data.

D) It allows new phones to be added to a network without rewiring or reconfiguring the network. 以下哪一项是不使用 VOIP 的优点？

a) VOIP 可以将公司的通信成本降低20到30%。

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B) 它允许将电子邮件和语音邮件合并到一个目录中。 C) 它可以创建两个不同的语音和数据网络。

D) 它允许将新手机添加到网络中, 而无需重新布线或配置网络。

Answer: C Diff: 2 Page Ref: 265 AACSB: Use of IT CASE: Comprehension Objective: 7.3

46) The child domain of the root is the 根的子域是

A) top-level domain. B) second-level domain. C) host name.

D) domain extension. Answer: A Diff: 2 Page Ref: 258 AACSB: Use of IT CASE: Comprehension Objective: 7.3

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47) In the domain name \and third-level domains, respectively? A) \B) \C) \D) \Answer: C Diff: 2 Page Ref: 258-259 AACSB: Use of IT CASE: Comprehension Objective: 7.3

48) Which organization helps define the overall structure of the Internet? 哪个组织有助于定义互联网的总体结构？ A) none (no one \B) W3C C) ICANN D) IAB Answer: D Diff: 3 Page Ref: 260 AACSB: Use of IT CASE: Comprehension Objective: 7.3

49) IPv6 is being developed in order to 正在开发 IPv6, 以

A) update the packet transmission protocols for higher bandwidth.

B) create more IP addresses. 创造更多的饿IP地址 C) allow for different levels of service. D) support Internet2. Answer: B Diff: 2 Page Ref: 261 AACSB: Use of IT CASE: Comprehension Objective: 7.3

50) Which of the following services enables logging on to one computer system and working on another?

下列哪种服务能够登录到一个计算机系统并在另一个系统上工作？---FTP A) FTP 迅雷 B) LISTSERV C) Telnet

D) World Wide Web Answer: A Diff: 3 Page Ref: 261

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