Circuit-switching technology is used in Public Switched Telephone Network(PSTN), Global System for Mobile Communications(GSM) and Code Division Multiple Access(CDMA). It is a ( ) information transfer mode.A.Connection oriented B.connectionless C.High band

题目
Circuit-switching technology is used in Public Switched Telephone Network(PSTN), Global System for Mobile Communications(GSM) and Code Division Multiple Access(CDMA). It is a ( ) information transfer mode.

A.Connection oriented
B.connectionless
C.High bandwidth utilization
D.Poor-real-time

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  • 第1题:

    Circuit-switching technology is used in Publish Switched Telephone Network(PSTN), Global System for Mobile Communications(GSM) and code Division Multiple Access (CMDA) .It is a ( ) information transfer mode.

    A.connection oriented

    B.connectionless

    C.high bandwidth utilization

    D.poor real-time


    正确答案:D

  • 第2题:

    GSM的英文全称是()

    A.Global System for Mobile

    B.Global Style for Mobile

    C.Gold System for Mobile

    D.Global System Mobile


    参考答案:A

  • 第3题:

    The term computer describes a device made up of a combination of electronic components.By itself, a computer has no ( ) and is referred to as hardware, which means simply the physical equipment. The hardware can't be used until it is connected to other elements, all of which constitute the six parts of a computer-based information system,hardware,software,data/information, people, procedures and communications.A system is defined as a collection of related components that ( ) to perform a task in order to accomplish a goal. Any organization that uses information technology will have a computer-based information system to provide managers (and various categories of employees with the appropriate kind of information to help them make decisions.Systems analysis and design is to ascertain how a system works and then take steps to make it ( ) Often, a system approach is used to define, describe, and solve a problem or to meet a(an)( )From time to time, organizations need to (请作答此空)their information systems, in, responseto new marketing' opportunities, modified government regulations, the introduction .of new technology, merger with another company, or other developments. When change is needed, the time is ripe for applying the principles of systems analysis and design.

    A.modify
    B.replace
    C.Change
    D.transfer

    答案:C
    解析:
    计算机这个术语描述由电子的和机电的部件组合而成的一种设备。计算机本身没有只能,因此称为硬件,仅仅是物理设备。硬件只有和其他要素连接才能使用,所有这些要素即为构成基于计算机信息系统的六要素:硬件、软件、数据/信息、人、操作程序和通信。系统定义为一组相关组件的集合,这些组件相互交互以完成一个任务,以实现一个目标。任何使用信息技术的组织会拥有一个基于计算机的信息系统,给管理人员(和各类员工)提供适当类型的信息以帮助他们做出决策。系统分析和设计是确定系统如何工作然后经过一系列步骤以使其更好。通常,采用系统方法来定义、描述和解决一个问题或满足一个目标。随着时间推移,新的市场机会、政府规定的变化、新技术的出现、公司兼并以及其他方面的发展等,使得组织需要改变其信息系统。当需要改变时,应用系统分析与设计的时机已经成熟。

  • 第4题:

    CDMA (Code Division Multiple Access)


    正确答案:又称码分多址,是在无线通讯上使用的技术,CDMA允许所有的使用者同时使用全部频带(1.2288Mhz),并且把其他使用者发出的讯号视为杂讯,完全不必考虑到讯号碰撞(collision)的问题。CDMA的优点包括:CDMA中所提供的语音编码技术,其通话品质比目前的GSM好,而且可以把用户对话时周围环境的噪音降低,使通话更为清晰。CDMA利用展频的通讯技术,因而可以减少手机之间的干扰,并且可以增加用户的容量,而且手机的功率还可以做的比较低,不但可以使使用时间更长,更重要的是可以降低电磁波辐射对人的伤害。CDMA的带宽可以扩展较大,还可以传输影像呢,这是第三代手机为什么选用CDMA的原因。就安全性能而言,CDMA不但有良好的认证体制,更因为其传输的特性,用码来区分用户,防止被人盗听的能力大大地增强。目前CDMA系统正快速发展中。WidebandCDMA(WCDMA.宽带码分多址传输技术,为IMT-2000的重要基础技术,将是第三代数字无线通信系统的标准之一。

  • 第5题:

    3G是()英文缩写,GSM的英文表示是Global System for Mobile Communications,汉语意思是全球移动通信系统。


    正确答案:3th Generation

  • 第6题:

    GSM(Global System for Mobile Communications)是指()


    正确答案:全球移动通信系统

  • 第7题:

    GSM的英文全称是()

    • A、Global System for Mobile
    • B、Global Style for Mobile
    • C、Gold System for Mobile
    • D、Global System  Mobile

    正确答案:A

  • 第8题:

    All client computers on your company network run Windows 7 and are members of an Active Directory Domain Services domain. Your company policy requires that all unnecessary services be disabled on the computers. The Sales department staff has been provided with new mobile broadband adapters that use the Global System for Mobile Communications (GSM) technology. You need to ensure that portable computers can connect to the broadband GSM network. Which service should be enabled on the portable computers?()

    • A、WLAN AutoConfig
    • B、WWAN AutoConfig
    • C、Computer Browser
    • D、Portable Device Enumerator Service

    正确答案:B

  • 第9题:

    单选题
    An alternative to plain old telephone service (POTS) would be:()
    A

    X.25.

    B

    Asynchronous transfer mode (ATM).

    C

    VoIP.

    D

    Public Switched Telephone Network (PSTN).


    正确答案: C
    解析: 暂无解析

  • 第10题:

    单选题
    公众电话交换网(PSTN,PuBlic SwitcheD Telephone Network)是承载话音业务的基础网络,其采用的技术是()。
    A

    话音交换技术

    B

    数据交换技术

    C

    集中交换技术

    D

    电路交换技术


    正确答案: A
    解析: 暂无解析

  • 第11题:

    填空题
    GSM(Global System for Mobile Communications)是指()

    正确答案: 全球移动通信系统
    解析: 暂无解析

  • 第12题:

    名词解释题
    CDMA (Code Division Multiple Access)

    正确答案: 又称码分多址,是在无线通讯上使用的技术,CDMA允许所有的使用者同时使用全部频带(1.2288Mhz),并且把其他使用者发出的讯号视为杂讯,完全不必考虑到讯号碰撞(collision)的问题。CDMA的优点包括:CDMA中所提供的语音编码技术,其通话品质比目前的GSM好,而且可以把用户对话时周围环境的噪音降低,使通话更为清晰。CDMA利用展频的通讯技术,因而可以减少手机之间的干扰,并且可以增加用户的容量,而且手机的功率还可以做的比较低,不但可以使使用时间更长,更重要的是可以降低电磁波辐射对人的伤害。CDMA的带宽可以扩展较大,还可以传输影像呢,这是第三代手机为什么选用CDMA的原因。就安全性能而言,CDMA不但有良好的认证体制,更因为其传输的特性,用码来区分用户,防止被人盗听的能力大大地增强。目前CDMA系统正快速发展中。WidebandCDMA(WCDMA.宽带码分多址传输技术,为IMT-2000的重要基础技术,将是第三代数字无线通信系统的标准之一。
    解析: 暂无解析

  • 第13题:

    CDMA for cellular system can be described as follows. As with FDMA, each cell is allocated a frequency (71) , when is split into two parts, half for reverse (mobile unit to base station) and half for (72) (base station to mobile unit). For full-duplex (73) , a mobile unit both reverse and forward channels. Transmission is in the form. of direct-sequence spread (74) , which used a chipping code to increase the data rate of the transmission, resulting is an increased signal bandwidth. Multiple access is provided by assigning (75) chipping codes to multiple users, so that the receiver can recover the transmission of an individual unit from multiple transmissions.

    A.ware

    B.signal

    C.bandwidth

    D.domain


    正确答案:C
    用于蜂窝系统的CDMA技术可以描述如下。就像FDMA一样,每一个小区被分配了一个频带,该频带划分为两半,一半用于反向信道(从移动终端到基站),一半用于正向信道(从基站到移动终端)。在全双工通信中,移动终端使用了反向和正向两个信道。传输以直接序列扩频方式进行,用一个码片来增加传输的数据速率,同时也产生了额外的信号带宽。通过把正交的各个码片指定给不同的用户就可以实现多路访问,这样接收者就能够从多个传输中提取并恢复需要的传输单元。

  • 第14题:

    The meaning of ( ) is that access to protected information used be restricted to people who are authorized to access the information.

    A.digital signature
    B.encryption technology
    C.access control
    D.authentication technology

    答案:C
    解析:
    翻译:( )的含义是,对受保护信息的访问必须限于被授权访问该信息的人。A. 数字签名B. 加密技术C.访问控制D.认证技术

  • 第15题:

    WCDMA英文全称是Wideband Code Division Multiple Access,其系统带宽、码片速率分别是(),()。


    正确答案:5MHz;3.84Mbps

  • 第16题:

    GSM是以下哪个的简称()

    • A、Global System for Mobile communications
    • B、Global Standard for Mobile cellular
    • C、General Standard for Mobile cellular
    • D、General System for Mobile communications

    正确答案:A

  • 第17题:

    An alternative to plain old telephone service (POTS) would be:()

    • A、X.25.
    • B、Asynchronous transfer mode (ATM).
    • C、VoIP.
    • D、Public Switched Telephone Network (PSTN).

    正确答案:C

  • 第18题:

    公众电话交换网(PSTN,PuBlic SwitcheD Telephone Network)是承载话音业务的基础网络,其采用的技术是()。

    • A、话音交换技术
    • B、数据交换技术
    • C、集中交换技术
    • D、电路交换技术

    正确答案:D

  • 第19题:

    In a switched LAN network, what is the Spanning-Tree algorithm used for?()

    • A、It is used to provide a mechanism for routing updates in switched environments.
    • B、It is used to prevent routing loops in networks with redundant routes.
    • C、It is used to prevent switching loops in networks with redundant switched routes.
    • D、It is used to manage, the addition, deletion, and naming of VLANs across multiple switches.
    • E、It is used to segment a network into multiple collision domains.
    • F、None of the above.
    • G、All of the above are functions of STP.

    正确答案:C

  • 第20题:

    单选题
    Circuit-switching technology is used in Publish Switched Telephone Network(PSTN), Global System for Mobile Communications(GSM) and code Division Multiple Access (CMDA) . It is a ( ) information transfer mode.
    A

    connection oriented

    B

    connectionless

    C

    high bandwidth utilization

    D

    poor real-time


    正确答案: C
    解析: 暂无解析

  • 第21题:

    填空题
    GSM-R(Global System for Mobile Communications for Railway)是指()。

    正确答案: 铁路数字移动通信系统
    解析: 暂无解析

  • 第22题:

    单选题
    What type of services are provided by the Cisco IOS gateways in a VoIP network with Cisco CallManager functionality? ()
    A

    Cisco IOS gateways provide services such as address translation and network access control for the devices on the networl

    B

    Cisco IOS gateways provide services such as bandwidth management and accounting

    C

    Cisco IOS gateways provide media termination and signal translation between the public switched telephone network (PSTN) and IP networks

    D

    Cisco IOS gateways provide zone management for all registered endpoints in the network


    正确答案: B
    解析: 暂无解析

  • 第23题:

    填空题
    3G是()英文缩写,GSM的英文表示是Global System for Mobile Communications,汉语意思是全球移动通信系统。

    正确答案: 3th Generation
    解析: 暂无解析