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多选题
When a router converts analog signals to digital signals， what three steps are always included in the process？ （）
A
involution
B
encoding
C
sampling
D
quantization
E
compression
F
companding
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Which ISDN device converts the four－wire BRI signals from an S／T interface into two－wire signals of a U interface?()
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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.
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When analog signals are digitized using the G.711 codec， voice samples are encapsulated into protocol data units （PDUs） involving which three headers？ （）A、IPB、TCPC、RTPD、UDPE、H323F、CRTP
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Which two statements are true about analog to digital conversion of voice signals for use in digital telephony networks？（）A、The three required steps in the analog to digital conversion are sampling，encoding，and compression.B、The three required steps in the analog to digital conversion are sampling，quantization，and compression.C、The three required steps in the analog to digital conversion are sampling，quantization，and encoding.D、The output of the sampling process is a pulse code modulation （PCM） signal.E、The output of the sampling process is a pulse amplitude modulation （PAM） signal.
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Which statement is true about the capabilities of a voice gateway router？（）A、voice gateways with analog interfaces need a gatekeeper to convert analog signals into digital format before voice is encapsulated into IP packetsB、voice gateways need a gatekeeper to interconnect the VoIP networks the PSTN networkC、voice gateways with Cisco Unified CallManager Express （CME） can permanently act as a call agent for IP phonesD、voice gateways equipped with a DSP module can take the role of the call agent during WAN failure.
考题
Which three functions are associated with a Cisco Unified CallManager？ （）A、 connects traditional telephony devices to voice over IP infrastructureB、 converts analog signals to digital formatC、 performs voice compressionD、 performs call processingE、 performs dial plan administrationF、 performs signaling and device control
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What is the term that is used to describe the process of converting a signal from digital to analog？（）A、 packetizationB、 quantizationC、 decodingD、 sampling
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When a router converts analog signals to digital signals， what three steps are always included in the process？（）A、involutionB、encodingC、samplingD、quantizationE、compressionF、companding
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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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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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What are two steps that are taken when a router converts a voice signal from analog to digital form？（）A、samplingB、packetizationC、quantizationD、serialization
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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 ISDN device converts the four-wire BRI signals from an S/T interface into two-wire signals of a U interface?（）A
TE1B
NT-2C
TAD
TE2E
NT-1
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多选题When analog signals are digitized using the G.711 codec， voice samples are encapsulated into protocol data units （PDUs） involving which three headers？ （）AIPBTCPCRTPDUDPEH323FCRTP
考题
单选题What are two steps that are taken when a router converts a voice signal from analog to digital form？（）A
samplingB
packetizationC
quantizationD
serialization
考题
多选题When a router converts analog signals to digital signals， what three steps are always included in the process？（）AinvolutionBencodingCsamplingDquantizationEcompressionFcompanding
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多选题Which three functions are associated with a Cisco Unified CallManager？ （）Aconnects traditional telephony devices to voice over IP infrastructureBconverts analog signals to digital formatCperforms voice compressionDperforms call processingEperforms dial plan administrationFperforms signaling and device control
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多选题Which two statements are true about analog to digital conversion of voice signals for use in digital telephony networks？（）AThe three required steps in the analog to digital conversion are sampling，encoding，and compression.BThe three required steps in the analog to digital conversion are sampling，quantization，and compression.CThe three required steps in the analog to digital conversion are sampling，quantization，and encoding.DThe output of the sampling process is a pulse code modulation （PCM） signal.EThe output of the sampling process is a pulse amplitude modulation （PAM） signal.
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单选题Why should the SES operators be very careful when the ship enters the area where three ocean regions overlap? Because（）.A
the weather is always terribleB
the condition there is complicatedC
the signals are too strongD
their SES may receive the signals from unwanted satellite
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What are two steps that are taken when a router converts a voice signal from analog to digital form？（）AsamplingBpacketizationCquantizationDserialization
考题
单选题why should the SES operators be very careful when the ship enters the area where three ocean regions overlap? Because（）.A
the weather over there is always terribleB
the condition there is complicatedC
the signals are too strongD
their SES may receive the signals from unwanted satellite
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
考题
单选题What is the term that is used to describe the process of converting a signal from digital to analog？（）A
packetizationB
quantizationC
decodingD
sampling
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