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

题目

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

相似考题

1.Theprocessquantizingthecontinuousvaluesintoabinaryscaleiscalled().A.digital-to-analogconversionB.digital-to-digitalconversionC.analog-to-digitalconversionD.analog-to-analogconversion

2.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

3.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

4.The purpose of the(73)is to provide fully integrated analog services to users.A．ISDNB．WWWC．FTPD．HTTP

更多“When analog signals&”相关问题

第1题：

共用题干
第一篇

Forecasting Methods

There 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 analog
B:the analog looks complicated
C:the analog is more than 10 years old
D:the current weather scenario is exactly the same as the analog

答案：A
解析：
由文章第一段第二句话“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.”可知答案。
由文章第二段最后一句话“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.”可知答案。
由第三段倒数第二句话“The trends method works well when systems continue to move at the same speed in the same direction for a long period of time.”可知答案。
由最后一段第二句话“It involves examining today ' s forecast scenario and remembering a day in the past when the weather scenario looked veiy similar ( an analog).”可知答案。
由第四段前两句“The climatology method is another simple way of producing a forecast.This method involves averaging weather statistics accumulated over many years to make the fore- cast.”和最后一段前两句“The analog method is a slightly more complicated method of producing a forecast.It involves examining today's forecast scenario and remembering a day in the past when the weather scenario looked very similar ( an analog).”可知气候学方法和类比法这两种天气预报法都需要以往的天气方面的数据。
第2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3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
正确答案:B,C,D
第4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5题：

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)
正确答案:D
第6题：

What are two steps that are taken when a router converts a voice signal from analog to digital form？（）
- A、sampling
- B、packetization
- C、quantization
- D、serialization
正确答案:A,C
第7题：

Which of the following features should a technician consider when purchasing a KVM switch for adatacenter？（）
- A、PCI slots available
- B、Scalability and flexibility
- C、Number of analog modems provided
- D、Number of video conference devices connected
正确答案:B
第8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9题：

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？（）
A
IP
B
TCP
C
RTP
D
UDP
E
H323
F
CRTP

正确答案： F,C
解析：暂无解析
第10题：

多选题
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.

正确答案： B,E
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： C
解析：暂无解析
第12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
第13题：

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.
正确答案:C,E
第14题：

在音响调音专业中，ANALOG表示（）。

正确答案:模拟方式
第15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16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 interfaces is used to connect analog devices to the Internet?（）
- A、POTS
- B、ATM
- C、VDSL
- D、SDSL
正确答案:A
第19题：

When comparing analog display inputs to digital display inputs, which of the following is anadvantage that digital has over analog?（）
- A、Allows for higher brightness
- B、More crosstalk
- C、Sustains higher resolutions
- D、Supports widescreen resolutions
正确答案:C
第20题：

What is the minimum connection required for Call Home on an IBM System Storage DS8000?（）
- A、ISDN connection
- B、Analog telephone line
- C、Ethernet internet connection
- D、Both an analog telephone line and an ethernet connection
正确答案:B
第21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22题：

单选题
What are two steps that are taken when a router converts a voice signal from analog to digital form？（）
A
sampling
B
packetization
C
quantization
D
serialization

正确答案： A
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 consideredaDTEdevice
F
A router is commonly considereda DCE device

正确答案： A,D,E
解析：暂无解析

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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

题目

相似考题

更多“When analog signals&”相关问题

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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

题目

相似考题

更多“When analog signals&”相关问题

相关内容

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