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
When analog signals are digitized using the G.711 codec， voice samples are encapsulated into protocol data units （PDUs） involving which three headers？ （）
- A、IP
- B、TCP
- C、RTP
- D、UDP
- E、H323
- F、CRTP
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Theprocessquantizingthecontinuousvaluesintoabinaryscaleiscalled(). A.digital-to-analogconversionB.digital-to-digitalconversionC.analog-to-digitalconversionD.analog-to-analogconversion
The purpose of the(73)is to provide fully integrated analog services to users.A．ISDNB．WWWC．FTPD．HTTP
Digital computer is controlled by internally stored programs and(66) of using common storage for all or part of a program and also for all or part of the data necessary for the execution of the programs; executing user-written or user-designated programs; performing user-designated manipulation of digitally represented discrete data, including.(67) operations and logic operations; and executing programs that(68) themselves during their execution.Analog computer's operations are analogous to the(69) of another system and that accepts, processes, and produces analog data.(70) computer integrates analog computer components and digital computer components by interconnection of digital-to-analog converters and analog-to-digital converters.A．qualifiedB．competentC．capableD．able
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共用题干第一篇Forecasting MethodsThere are several different methods that can be used to create a forecast. The method a forecaster chooses depends upon the experience of the forecaster,the amount of information available to the forecaster,the level of difficulty that the forecast situation presents,and the degree of accuracy or confidence needed in the forecast.The first of these methods is the persistence method,the simplest way of producing a forecast.The per- sistence method assumes that the conditions at the time of the forecast will not change.For example,if it is sunny and 87 degrees today,the persistence method predicts that it will be sunny and 87 degrees tomorrow. If two inches of rain fell today,the persistence method would predict two inches of rain for tomorrow. However,if weather conditions change significantly from day to day,the persistence method usually breaks down and is not the best forecasting method to use.The trends method involves determining the speed and direction of movement for fronts,high and low pressure centers , and areas of clouds and precipitation（降水量）.Using this information , the forecaster can predict where he or she expects those features to be at some future time.For example,if a storm system is 1,000 miles west of your location and moving to the east at 250 miles per day,using the trends method you would predict it arrive in your area in 4 days.The trends method works well when systems continue to move at the same speed in the same direction for a long period of time.If they slow down,speed up,change intensi- ty,or change directions,the trends forecast will probably not work as well.The climatology（气候学）method is another simple way of producing a forecast. This method involves averaging weather statistics accumulated over many years to make the forecast.For example,if you were using the climatology method to predict the weather for New York City on July 4th,you would go through all the weather data that has been recorded for every July 4th and take an average.The climatology method oniy works well when the weather pattern is similar to that expected for the chosen time of year. If the pattern is quite unusual for the given time of year,the climatology method will often fail.The analog method is a slightly more complicated method of producing a forecast.It involves examining today's forecast scenario（模式）and remembering a day in the past when the weather scenario looked very similar(an analog).The forecaster would predict that the weather in this forecast will behave the same as ii did in the past.The analog method is difficult to use because it is virtually impossible to find a predict ana- log.Various weather features rarely align themselves in the same locations as they were in the previous time. Even small differences between the current time and the analog can lead to very different results.The analog method should not be used in making a weather forecast when________.A: the current weather scenario is different from the analogB:the analog looks complicatedC:the analog is more than 10 years oldD:the current weather scenario is exactly the same as the analog
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 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
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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
What best describes an FXO interface？（）A、analog trunks that provide the Survivable Remote Site Telephony (SRST) feature B、analog trunks that provide VoIP gateway functionality C、analog trunks that connect a gateway to plain old telephone service (POTS) device such as analog phones, fax machines, and legacy voice-mail systems D、analog trunks that connect a gateway to a central office (CO) or private branch exchange (PBX)
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.
What are two steps that are taken when a router converts a voice signal from analog to digital form？（）A、samplingB、packetizationC、quantizationD、serialization
Which of the following interfaces is used to connect analog devices to the Internet?（）A、POTSB、ATMC、VDSLD、SDSL
Which of the following features should a technician consider when purchasing a KVM switch for adatacenter？（）A、PCI slots availableB、Scalability and flexibilityC、Number of analog modems providedD、Number of video conference devices connected
When comparing analog display inputs to digital display inputs, which of the following is anadvantage that digital has over analog?（）A、Allows for higher brightnessB、More crosstalkC、Sustains higher resolutionsD、Supports widescreen resolutions
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.
What is the minimum connection required for Call Home on an IBM System Storage DS8000?（）A、ISDN connectionB、Analog telephone lineC、Ethernet internet connectionD、Both an analog telephone line and an ethernet connection
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
单选题Which statement is true about the digital to analog conversion process？（）Athe two steps of digital to analog conversion are decompression and reconstruction of the analog signalBthe two steps of digital to analog conversion are decoding and filteringCthe two steps of digital to analog conversion are decompression and filtering of the analog signalDthe two steps of digital to analog conversion are quantization and decoding
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.
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
单选题What is the difference between a CSU/DSU and a modem?（）AA CSU/DSU converts analog signals from a router to a leased line; a modem converts analog signals from a router to a leased lineBA CSU/DSU converts analog signals from a router to a phone line; a modem converts digital signals from a router to a leased lineCA CSU/DSU converts digital signals from a router to a phone line; a modem converts analog signals from a router to a phone lineDA CSU/DSU converts digital signals from a router to a leased line; a modem converts digital signals from a router to a phone line
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
单选题What is the difference between a CSU/DSU and a modem？（）AA CSU/DSU converts analog signals from a router to a leased line; a modem converts analog signals from a router to a leased line.BA CSU/DSU converts analog signals from a router to a phone line; a modem converts digital signals from a router to a leased line.CA CSU/DSU converts digital signals from a router to a phone line; a modem converts analog signals from a router to a phone line.DA CSU/DSU converts digital signals from a router to a leased line; a modem converts digital signals from a router to a phone line.