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单选题Which test checks the transmitter and receiver of a local modem？（）A data parityB analog loop backC local digital loop backD remote digital loop back

题目
单选题
Which test checks the transmitter and receiver of a local modem？（）
A

data parity

B

analog loop back

C

local digital loop back

D

remote digital loop back

相似考题

1.As a network administrator, you will need to decide on the appropriate network devices to use. Which of the following correctly describes the roles of devices in a WAN? (Choose three)A. A CSU/DSU terminates a digital local loop.B. A router is commonly considered a DCE device.C. A modem terminates an analog local loop.D. A router is commonly considered a DTE device.E. A modem terminates a digital local loop.F. A CSU/DSU terminates an analog local loop.G. A modem is used to terminate a T1

2.第一组An automatic system usually consists of a control system and an information system. A control system is a system which measures the condition of some entity and, with the information, governs the state of a variable; i.e., speed, temperature, pressure, position, etc. The open-loop system is the simplest form. a control system may assume. It is distinguished from the closed-loop system by the lack of an input which measures the state of the controlled variable; such an input is called a feedback. In modern ships the open-loop system has practically disappeared and the closed-loop system which operates with a feed-back is extensively used. An information system serves the parallel function of monitoring system or plant performance. The monitoring function may serve a number of purposes; specifically it may indicate values of controlled variables to guide remote control operations, warn of off-limit conditions and provide record of performance. In many cases a visual and audible alarm may be provided to warn of off-limit conditions on board ship and, associated with this, the important variables will be recorded on demand. The automatic control system can be more sophisticated by incorporating digital-processing equipment, that is, a computer. This computer is usually fed with signals from all sensors. It scans the values of the sensors and generates alarm signals for off-limit conditions, acting as a super-supervisor. Sometimes, it can even make necessary and take the necessary action to optimize performance without human intervention.The closed-loop system differs from the open-loop system byA.the lack of a feedbackB.the presence of a feed backC.the lack of a computerD.the presence of a computer

3.Which of the following describes the roles of devices in a WAN? ()A.A CSU/DSU terminates a digital local loopB.A modem terminates a digital local loopC.A CSU/DSU terminates an analog local loopD.A modem terminates an analog local loopE.A router is commonly considered a DTE deviceF.A router is commonly considered a DCE device

4._______control system is one in which the control action is independent of the output.A.Feed backB.Negative feed backC.Close loopD.Open loop

更多“单选题Which test checks the transmitter and receiver of a local modem？（）A data parityB analog loop backC local digital loop backD remote digital loop back”相关问题

  • 第1题：

    The network administrator must complete the connection between the RTA of the XYZ Company and the service provider. To accomplish this task, which two devices could be installed at the customer site to provide a connection through the local loop to the central office of the provider (Choose two.)（）。

    A.WAN switch

    B.PVC

    C.ATM switch

    D.multiplexer

    E.CSU/DSU

    F.modem


    参考答案：E, F

  • 第2题：

    When troubleshooting a Frame Relay connection, what is the first step when performing a loopback test?()

    A.Set the encapsulation of the interface to HDLC

    B.Place the CSU/DSU in local-loop mode

    C.Enable local-loop mode on the DCE Frame Relay router

    D.Verify that the encapsulation is set to Frame Relay


    参考答案：A

  • 第3题：

    下列关于loop back interface的说法（）是不正确的？

    • A、loop back interface是CISCO路由器上缺省端口
    • B、loop back interface一个永远不会DOWN的逻辑端口
    • C、loop back interface是一个做自环测试的端口
    • D、loop back interface是对端使用LOOPBACK命令测试链路后本端的端口状态

    正确答案:A,C,D

  • 第4题：

    When troubleshooting a Frame Relay connection, what is the first step when performing a loopback test?（）

    • A、Set the encapsulation of the interface to HDLC
    • B、Place the CSU/DSU in local-loop mode
    • C、Enable local-loop mode on the DCE Frame Relay router
    • D、Verify that the encapsulation is set to Frame Relay

    正确答案:A

  • 第5题：

    Which of the following describes the roles of devices in a WAN? （）

    • A、A CSU/DSU terminates a digital local loop
    • B、A modem terminates a digital local loop
    • C、A CSU/DSU terminates an analog local loop
    • D、A modem terminates an analog local loop
    • E、A router is commonly considered a DTE device
    • F、A router is commonly considered a DCE device

    正确答案:A,D,E

  • 第6题：

    Which statement is true about the digital to analog conversion process？（）

    • A、the two steps of digital to analog conversion are decompression and reconstruction of the analog signal
    • B、the two steps of digital to analog conversion are decoding and filtering
    • C、the two steps of digital to analog conversion are decompression and filtering of the analog signal
    • D、the two steps of digital to analog conversion are quantization and decoding

    正确答案:B

  • 第7题：

    Which test checks the transmitter and receiver of a local modem？（）

    • A、data parity
    • B、analog loop back
    • C、local digital loop back
    • D、remote digital loop back

    正确答案:B

  • 第8题：

    When a local loopback is activated on a PPP serial link, what indicates that the local interface is good?（）

    • A、A ping to the local address succeeds.
    • B、A ping to the remote address succeeds.
    • C、A ping to the remote address received a 'TTL expired' message.
    • D、The interface shows a flag indicating that a loop is detected.

    正确答案:D

  • 第9题：

    单选题
    Which statement is true about the digital to analog conversion process？（）
    A

    the two steps of digital to analog conversion are decompression and reconstruction of the analog signal

    B

    the two steps of digital to analog conversion are decoding and filtering

    C

    the two steps of digital to analog conversion are decompression and filtering of the analog signal

    D

    the two steps of digital to analog conversion are quantization and decoding


    正确答案： C
    解析： 暂无解析

  • 第10题：

    单选题
    Which test checks the transmitter and receiver of a local modem？（）
    A

    data parity

    B

    analog loop back

    C

    local digital loop back

    D

    remote digital loop back


    正确答案： A
    解析： 暂无解析

  • 第11题：

    单选题
    What is the difference between a CSU/DSU and a modem?（）
    A

    A CSU/DSU converts analog signals from a router to a leased line; a modem converts analog signals from a router to a leased line.

    B

    A CSU/DSU converts analog signals from a router to a phone line; a modem converts digital signals from a router to a leased line.

    C

    A CSU/DSU converts digital signals from a router to a phone line; a modem converts analog signals from a router to a phone line.

    D

    A CSU/DSU converts digital signals from a router to a leased line; a modem converts digital signals from a router to a phone line.


    正确答案： B
    解析： 暂无解析

  • 第12题：

    单选题
    When troubleshooting a Frame Relay connection, what is the first step when performing a loopback test?（）
    A

    Set the encapsulation of the interface to HDLC

    B

    Place the CSU/DSU in local-loop mode

    C

    Enable local-loop mode on the DCE Frame Relay router

    D

    Verify that the encapsulation is set to Frame Relay


    正确答案： A
    解析： 暂无解析

  • 第13题：

    Which of the following describes the roles of devices in a WAN (Choose three.)()。

    A.A CSU/DSU terminates a digital local loop.

    B.A modem terminates a digital local loop.

    C.A CSU/DSU terminates an analog local loop.

    D.A modem terminates an analog local loop.

    E.A router is commonly considered a DTE device.

    F.A router is commonly considered a DCE device.


    参考答案：A, D, E

  • 第14题：

    下列关于loop back interface的说法()是不正确的?

    A.loop back interface是CISCO路由器上缺省端口

    B.loop back interface一个永远不会DOWN的逻辑端口

    C.loop back interface是一个做自环测试的端口

    D.loop back interface是对端使用LOOPBACK命令测试链路后本端的端口状态


    参考答案：A, C, D

  • 第15题：

    The network administrator must complete the connection between the RTA of the XYZ Company and the service provider. To accomplish this task, which two devices could be installed at the customer site to provide a connection through the local loop to the central office of the provider (Choose two.)（）。

    • A、WAN switch
    • B、PVC
    • C、ATM switch
    • D、multiplexer
    • E、CSU/DSU
    • F、modem

    正确答案:E,F

  • 第16题：

    Which of the following describes the roles of devices in a WAN?（）

    • A、A CSU/DSU terminates a digital local loop
    • B、A modem terminates a digital local loop
    • C、A CSU/DSU terminates an analog local loop
    • D、A modem terminates an analog local loop
    • E、A router is commonly consideredaDTEdevice
    • F、A router is commonly considereda DCE device

    正确答案:A,D,E

  • 第17题：

    What is the difference between a CSU/DSU and a modem?（）

    • A、A CSU/DSU converts analog signals from a router to a leased line; a modem converts analog signals from a router to a leased line
    • B、A CSU/DSU converts analog signals from a router to a phone line; a modem converts digital signals from a router to a leased line
    • C、A CSU/DSU converts digital signals from a router to a phone line; a modem converts analog signals from a router to a phone line
    • D、A CSU/DSU converts digital signals from a router to a leased line; a modem converts digital signals from a router to a phone line

    正确答案:D

  • 第18题：

    Which of the following describes the roles of devices in a WAN?（）

    • A、A CSU/DSU terminates a digital local loop.
    • B、A modem terminates a digital local loop.
    • C、A CSU/DSU terminates an analog local loop.
    • D、A modem terminates an analog local loop.
    • E、A router is commonly considered a DTE device.
    • F、A router is commonly considered a DCE device.

    正确答案:A,D,E

  • 第19题：

    An optical cable is used to transmit：（）

    • A、digital audio from a component to a receiver.
    • B、analog video from a component to a receiver.
    • C、analog audio from a component to a receiver.
    • D、digital video from a component to a receiver.

    正确答案:A

  • 第20题：

    单选题
    When a local loopback is activated on a PPP serial link, what indicates that the local interface is good?（）
    A

    A ping to the local address succeeds.

    B

    A ping to the remote address succeeds.

    C

    A ping to the remote address received a 'TTL expired' message.

    D

    The interface shows a flag indicating that a loop is detected.


    正确答案： D
    解析： 暂无解析

  • 第21题：

    多选题
    Which of the following describes the roles of devices in a WAN? (Choose three.)（）
    A

    A CSU/DSU terminates a digital local loop.

    B

    A modem terminates a digital local loop.

    C

    A CSU/DSU terminates an analog local loop.

    D

    A modem terminates an analog local loop.

    E

    A router is commonly considered a DTE device.

    F

    A router is commonly considered a DCE device.


    正确答案： F,E
    解析： 暂无解析

  • 第22题：

    多选题
    Which of the following describes the roles of devices in a WAN?（）
    A

    A CSU/DSU terminates a digital local loop

    B

    A modem terminates a digital local loop

    C

    A CSU/DSU terminates an analog local loop

    D

    A modem terminates an analog local loop

    E

    A router is commonly consideredaDTEdevice

    F

    A router is commonly considereda DCE device


    正确答案： B,C
    解析： 暂无解析

  • 第23题：

    多选题
    Which of the following describes the roles of devices in a WAN？（）
    A

    A CSU/DSU terminates a digital local loop

    B

    A modem terminates a digital local loop

    C

    A CSU/DSU terminates an analog local loop

    D

    A modem terminates an analog local loop

    E

    A router is commonly considered a DTE device

    F

    A router is commonly considered a DCE device


    正确答案： D,A
    解析： 暂无解析

  • 第24题：

    单选题
    What is the difference between a CSU/DSU and a modem?（）
    A

    A CSU/DSU converts analog signals from a router to a leased line; a modem converts analog signals from a router to a leased line

    B

    A CSU/DSU converts analog signals from a router to a phone line; a modem converts digital signals from a router to a leased line

    C

    A CSU/DSU converts digital signals from a router to a phone line; a modem converts analog signals from a router to a phone line

    D

    A CSU/DSU converts digital signals from a router to a leased line; a modem converts digital signals from a router to a phone line


    正确答案： A
    解析： 暂无解析

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