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About common test items for Ethernet service, which of the following are correct?()

A.Throughput is the maximum available transmission rate in case of no packet losses.

B.Frame. loss rate is the percentage of successfully forwarded packets out of a certain traffic loaD.Causes for packet loss include network congestion, timeout, disorder and frame. error.

C.Latency is the interval from when a packet is received to when it is forwarded in case of no packet losses. Perform. latency test for several times and take their average value.

D.Back-to-back frames refer to maximum number of packets that can be processed by an IP network device, in case of no losses of packets which are received at a minimum transmission interval.

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更多“About common test items for Et…”相关的问题

第1题

The test will（)answering questions about a photograph.

A.contain

B.include

C.involve

D.relate

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第2题

古诺模型和伯特兰模型的相同之处是什么？两个模型有何区别？What do the Cournot and Bertrand models have in common？ What is different about the two models？

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第3题

About Smartbits, which of the following are correct?()

A.Smartbits uses SmartApplication to realize test set based on RFC-1242, RFC-2544.

B./ nSmartbits can measure the following index:/ nframe. loss/ nthroughput/ nlatency/ nback to back

C./ nTo set a SmartBits, you must connect COM of PC with CONSOLE of SmartBits by serial port cable to run hyperterminal.

D.SmartBits600 can be configured with 2 LAN-3100A modules and can test 16 10/100M Ethernet ports.

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第4题

During recent years we have heard much about “race”: how this race does certain things

and that race believes certain things and so on. Yet, the __41__ phenomenon of race consists of a few surface indications.

We judge race usually __42__ the coloring of the skin: a white race, a brown race, a yellow race and a black race. But __43__ you were to remove the skin you could not __44__ anything about the race to which the individual belonged. There is __45__ in physical structure. The brain or the internal organs to __46__ a difference.

There are four types of blood. __47__ types are found in every race, and n o type is distinct to any race. Human brains are the __48__. No scientists could examine a brain and told you the race to which the individual belonged. Brains will __49__ in size, but this occurs within every race. __50__ does size have anything to do with intelligence. The largest brain __51__ examined belonged to a person of weak __52__. On the other hand, some of our most distinguished people have had __53__ brains.

Mental tests which are reasonably __54__ show no differences in intelligence between races. High and low test results both can be recorded by different members of any race. __55__ equal educational advantages, there will be no difference in average standings, either on account of race or geographical location.

Individuals of every race __56__ civilization to go backward or forward. Training and education can change the response of a group of people, __57__ enable them to behave in a __58__ way.

The behavior. and ideas of people change according to circumstances, but they can always go back or go on to something new __59__ is better and higher than anything __60__ the past.

41. a. complete b. full c. total d. whole

42. a. in b. from c. at d. on

43. a. since b. if c. as d. while

44. a. speak b. talk c. tell d. mention

45. a. something b. everything

c. nothing d. anything

46. a. display b. indicate c. demonstrate d. appear

47. a. All b. Most c. No d. Some

48. a. same b. identical c. similar d. alike

49. a. remain b. increase c. decrease d. vary

50. a. Only b. Or c. Nor d. So

51. a. ever b. then c. never d. once

52. a. health b. body c. mind d. thought

53. a. big b. small c. minor d. major

54. a. true b. exact c. certain d. accurate

55. a. Provided b. Concerning

c. Given d. Following

56. a. make b. cause c. move d. turn

57. a. and b. but c. though d. so

58. a. ordinary b. peculiar c. usual d. common

59. a. that b. what c. whichever d. whatever

60. a. for b. to c. within d. in

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第5题

The ultimate test, in my child mind, for ______ （f...

The ultimate test, in my child mind, for ______ (find) out the difference between black and white, ______ (occur) one day in a bus station in Alabama. While ______ (wait) with my parents at the station. I ______ (study) the two water fountains against the far wall. Side by side they ______ (stand). A big sign above one ______ (read) “whites only”. The sign above the other fountain ______ (read) “colored only”. I ______ (decide) that once and for all I would ______ (satisfy) my curiosity about the water fountains which always ______ (carry) the signs above them. Was the water ______ (color) in the “colored only” one, or did it ______ (taste) different？ Since no one was ______ (watch) me, I ______ (slip) over and quickly ______ (take) a sip of the water in the “colored only” fountain. When I ______ (find) it ______ (be) every bit the same as the water in the “whites only” fountain, I ______ (run) back to my parents and ______ (shout), “Dad, I just ______ (drink) some water from the colored fountain and it ______ (taste) just the same as the other.” My father’s answer ______ (be) a quick, hard slap. That day I ______ (learn) not ______ (question) the difference between black and white.

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第6题

New measurements taken from sleeping people explain,at least in part,why dreams tend

to have such bizarre but vivid storylines.The findings deal a blow to the Freudian interpretation of dreams but leave open the possibility that some useful personal meaning can be extracted from them.The main purpose of dreams,however,the authors of the new study believe,is to test whether the brain has had enough sleep and,if so,to wake it up.The new results show that in sleep,the frontal lobes of the brain are shut down.In the absence of activity in these lobes,which integrate other information and make sense of the outside world,the sleeping brain's images are driven by its emotional centers.The content of these dreams may be vivid and gripping but lacks coherence.The new results are consistent with the theory that memories are consolidated during sleep.From the pattern of activity that was recorded,"it seems that memories already in the system are being read out and filed in terms of their emotional salience,with is an extremely interesting idea,"said Dr.J.Allan Hobson of Harvard Medical School.The new measurements were made by applying the technique known as PET scanning to sleeping subjects.The biologists focused on the two forms of sleep,known as slow-wave sleep and REM sleep.REM sleep,so named because of the rapid eyeball movements that occur then,takes palce about four times during the night and is the phase from which the most vivid dreams are recalled.

问题：Accoding to this study,the purpose of the dreams is to ()

A、test if the brain has had enough sleep

B、show the dreams bizarre but vivid storylines

C、prove the correctness of the Freudian interpretation of dreams

D、extract some useful personal meanings from the dreams

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第7题

Losing your ability to think and remember is prett...

Losing your ability to think and remember is prettyscary. We know the risk of dementia (痴呆症) increases with age. But if you have memory slips, you probably needn't worry. There are pretty clear differences between signs of dementia andage-related memory loss. After age 50, it's quite common to have trouble remembering the names of people, places andthings quickly, says Dr. Kirk Daffner of Brigham and Women's Hospital in Boston. The brain ages just like the rest of the body. Certain parts shrink, especially areas in the brainthat are important to learning, memory and planning. Changes in brain cells can affectcommunication between different regions of the brain. And blood flow can be reduced asblood vessels narrow. Forgetting the name of an actor in a favorite movie, for example, is nothing to worry about. Butif you forget the plot of the movie or don't remember even seeing it, that's far moreconcerning, Daffner says. When you forget entire experiences, he says, that's "a red flag that something more seriousmay be involved." Forgetting how to operate a familiar object like a microwave oven, orforgetting how to drive to the house of a friend you've visited many times before can also besigns of something going wrong. But even then, Daffner says, people shouldn't panic. There are many things that can causeconfusion and memory loss, including health problems like temporary stoppage of breathingduring sleep, high blood pressure, or depression, as well as medications (药物) likeantidepressants. You don't have to figure this out on your own. Daffner suggests going to your doctor to checkon medications, health problems and other issues that could be affecting memory. And the bestdefense against memory loss is to try to prevent it by building up your brain's cognitive (认知的) reserve, Daffner says. "Read books, go to movies, take on new hobbies or activities that force one to think in novelways," he says. In other words, keep your brain busy and working. And also get physicallyactive, because exercise is a known brain booster.Why does the author say that one needn't be concerned about memory slips？ 1..Why does the author say that one needn't be concerned about memory slips？()

A、Not all of them are symptoms of dementia.

B、They occur only among certain groups of people.

C、Not all of them are related to one's age.

D、They are quite common among fifty-year-olds.

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第8题

Which of the following statements are correct about the test of ZXCTN6200?()

A.The average optical power of the optical interface is measured as follows. One end of the pigtail is connected to the light emitting interface of the optical board and the other end is connected to the input interface of the optical power meter. After the optical power becomes stable, read the value, which is the transmitting optical power of the optical interface.

B.The average optical power of the optical interface is measured as follows. One end of the pigtail is connected to the light receiving interface of the optical board and the other end is connected to the input interface of the optical power meter. After the optical power becomes stable, read the value, which is the transmitting optical power of the optical interface.

C.The sensitivity and overload indicator of optical interface are measured as follows. Increase the adjustable optical attenuator gradually and observe the critical value when the optical interface generates an error code. Record the optical power value at this time, which is the sensitivity.

D.The sensitivity and overload indicator of optical interface are measured as follows. Reduce the adjustable optical attenuator gradually and observe the critical value when the optical interface generates an error code. Record the optical power value at this time, which is the overload indicator.

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第9题

In 1665,an apple fell from a tree and landed near young Isaac Newton.Untold numbers of

people had seen apples fall and hadn’t given the matter a second thought.But Newton thought about it carefully and developed a cornerstone of modern science—the theory of gravity.

The ability to ask deep questions and look for answers lies at the heart of science.So it stands to reason that educators would want to bottle Newton’s brand of thinking and serve it to their students.

Common sense might argue that the best means to that end is to cram future scientists with chemistry,physics,biology,and mathematics.After all,Newton had an enormous appetite for science.

But Newton owned more books in the humanities than he did in the sciences,and his interest included subjects such an history,philosophy,and Greek mythology.

Could it be that thinking deeply about subjects such as history,philosophy,and religion makes one a better scientist？many top American schools think so.

The liberal arts is diversified toolbox.If you have only one way of looking at things,you will get stuck in the same place everybody else got stuck.If you’ve got different experiences,you may find other ways of solving the problem.”

It’s well known that the more we think,the better our neural connections.But liberal arts colleges go one step further.They argue that learning to think in one field may sharpen the ability to solve complex problems in a seemingly unrelated area.It may be a while before scientists establish the truth or falsity of this idea.In the meantime,some of the best minds in science are betting that it’s true.

“Learning about the great books and the humanities can stimulate the sort of brain waves that serve a scientist pretty well,” says Nobel prize winner Tom Cech—“The more types of thinking you have to do,the more skills you can bring to a scientific problem."

26.We learn from the first paragraph that ________.

A.the ability to think is of first importance to scientific discovery

B.nobody noticed apples falling from trees to the ground before Newton

C.Newton developed the theory of gravity by watching a falling apple

27.According to the passage, to help students become scientists, educators________.

A.should cram them with lots of science courses

B.should make them think in the way Newton did

C.should ask them deep questions and look for answers

D.should give them an enormous appetite for science

28.We learn from the passage that students who study science in a liberal arts college ________.

A.are required to take a number of courses in the humanities

B.are free to take whatever courses they like best

C.have a wide range of interests in history, philosophy and religion

D.spend more time studying arts and the humanities than the sciences

29.The idea that learning to think in one field may sharpen the ability to solve complex problems in a seemingly unrelated area is ________.

A.already proved to be true by scientists

B.accepted by the best people in science

C.a common belief among liberal arts colleges

D.gaining worldwide acceptance

30.In liberal arts colleges students are _______.

A.asked to bring a diversified toolbox to school

B.trained to think differently from everybody else

C.required to learn different kinds of skills

D.taught to look at things in different ways

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第10题

Next week when I finish taking my final examination, I will also have finished one of

the best experiences I have ever had in my lifetime.In the last four months.I have learned more about foreign cultures than I expected before coming to the United States.

Living in a foreign country and going to school with people from various parts of the world has given me the opportunity to encounter and interact with people from different cultures.I would like to share some of my experiences and thoughts with you.When I first arrived.I knew no one and I needed all fingers to communicate what i said in English.All of the foreign students were in the same situation.When we could not find the right word we used strange movements and gestures to communicate our meaning.

Knowing some common phrases.such as How are you？ Fine.thank you.and what country are you from？was enough in the beginning for us to make friends with each other.The TV room in the dormitory became our meeting place every evening after dinner.but for the most part their words were just a strange mumble to us.

After a while, bored and a little sad, we slowly began to disappear to our rooms.I thought that all of us were experiencing some homesickness.However, despite my loneliness.I had a good feeling within myself because I was doing what I wanted to do for many years to live and study in a foreign country.

1.When I first arrived in the U.S().

A.I can speak English well

B.I have already had some friends there

C.I needed all my fingers to communicate in English

D.I could find the right word in speaking English

2.Why did we slowly begin to disappear to our room？()

A.Because we wanted to watched to watch television

B.Because we were bored and a little sad

C.Because we were experiencing homesickness

D.Because the TV room has become our meeting place

3.What is the thing I wanted to do for many years？ ()

A.To live and study in a foreign country

B.I had a good feeling within myself

C.To understand what the people appearing on the screen said

D.Not to be lovely

4.Which of the following sentence is wrong according to the passage？()

A.Studying in US is one of the best experiences I have ever had in my lifetime

B.I have learned more about foreign cultures than l expected

C.Some common phrases were enough in the beginning for us to make friends

D.Not all the foreign students were in the same situation

5.What is the author's attitude towards studying in a foreign country？()

A.He considered it a good experience

B.He dislike this experience

C.He didn't think it hard living in a foreign country

D.He felt sad when thinking of it

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第11题

The new studies show that fewer than half of the 9th graders in many of the nation’s l

argest cities，ever graduate.The studies clearly show that the dropout rate isn’t dropping.And，in particular，the dropout rate isn’t dropping for poor and minority students.

Amazingly，though so many people regret the rising dropout rate，our schools continue to lack formal plans—or any plans—about students’ motivation.Most schools have no game plans to ensure that students understand that school will be completely necessary.Schools expect the children to act as the school is important，but they never teach them to believe that.

Years ago，families ensured that the offspring recognized the value of school.But in many modern families，the children may fail to recognize the importance of school life just because these families may actually tell the children that school is not important.Since many families are not motivating their children to be interested students，young professionals，like teachers，may need to provide this training.Otherwise，it is likely that the dropout rate will continue to not drop，but only worsen.

Here are some strategies to convince even the most apathetic students that they must stay in school.

Ask students if they will ever need to work：The world has changed.100 years ago，factory work was the booming job，and it required no education.Today，factories are increasingly automated.Most computerrelated jobs require education and at least a high school diploma.

Ask students which century they will be prepared for：In 1900，the most common jobs were farm laborer and domestic servant—education not needed.Now，the most common jobs are office and sales worker—education and diploma usually needed.6 out of 10 people today work in a store or an office.

Ask students to devise a way that the employee could be replaced.For example，the coming trend in fast food is to use computers rather than people to run the restaurant.A prototype is apparently already being tested.The students should discover that most jobs that lack education and diploma requirements will be ripe for automation.

1.By saying “the dropout rate isn’t dropping”，the author means to say that ________.

A、most of the 9th graders can afford to go to school

B、quite a few of the 9th graders can graduate

C、the majority of the 9th graders cannot graduate

D、the minority of the 9th graders can’t graduate

2.The author’s attitude towards the schools is ________.

A、Criticism

B、Praise

C、Ignoring

D、Support

3.With the help of some professionals，________.

A、fewer students may stay in schools

B、some parents will be more convinced of their children’s future

C、the dropout rate in schools may drop

D、all the kids problems should be solved

4.What does the underlined word “offspring” probably mean？

A、friends

B、Students

C、Children

D、Parents

5.According to the passage，________ doesn’t need education.

A、an automation job of today

B、a computerrelated job now

C、an office job at present

D、a domestic servant’s job in 1900

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