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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
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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 signalB、the two steps of digital to analog conversion are decoding and filteringC、the two steps of digital to analog conversion are decompression and filtering of the analog signalD、the two steps of digital to analog conversion are quantization and decoding
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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.
考题
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
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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.
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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.
考题
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.
考题
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 signalB
the two steps of digital to analog conversion are decoding and filteringC
the two steps of digital to analog conversion are decompression and filtering of the analog signalD
the two steps of digital to analog conversion are quantization and decoding
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多选题Which of the following describes the roles of devices in a WAN? (Choose three.)（）AA CSU/DSU terminates a digital local loop.BA modem terminates a digital local loop.CA CSU/DSU terminates an analog local loop.DA modem terminates an analog local loop.EA router is commonly considered a DTE device.FA router is commonly considered a DCE device.
考题
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
考题
多选题Which of the following describes the roles of devices in a WAN?（）AA CSU/DSU terminates a digital local loopBA modem terminates a digital local loopCA CSU/DSU terminates an analog local loopDA modem terminates an analog local loopEA router is commonly consideredaDTEdeviceFA router is commonly considereda DCE device
考题
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.
考题
多选题Which of the following describes the roles of devices in a WAN？（）AA CSU/DSU terminates a digital local loopBA modem terminates a digital local loopCA CSU/DSU terminates an analog local loopDA modem terminates an analog local loopEA router is commonly considered a DTE deviceFA router is commonly considered a DCE device
考题
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 HDLCB
Place the CSU/DSU in local-loop modeC
Enable local-loop mode on the DCE Frame Relay routerD
Verify that the encapsulation is set to Frame Relay
考题
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 lineB
A CSU/DSU converts analog signals from a router to a phone line; a modem converts digital signals from a router to a leased lineC
A CSU/DSU converts digital signals from a router to a phone line; a modem converts analog signals from a router to a phone lineD
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
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