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提问人：网友yangtuzi2000 发布时间：2022-01-07

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The TCP protocolis a （71) layer protocol. Each connection connects two TCPs that may be ju

The TCP protocolis a (71) layer protocol. Each connection connects two TCPs that may be just one physical network apart or located on opposite sides ofthe globe. In other words, each connection creates a (72) witha length that may be totally different from another path created by another connection. This means that TCP cannot use the same retransmission time for all connections. Selecting afixed retransnussion time for all connections can result in serious consequences. Ifthe retransmission time does not allow enough time for a (73) to reach the destination and an acknowledgment to reach the source, it can result in retransmission of segments that are still on the way. Conversely, if the retransnussion time is longer than necessary for a short path, it may result in delay for the application programs.Even for one single connection, the retransmission time should not be fixed.A connection may be able to send segments and receive (74)faster during nontraffic period than during congested periods. TCP uses the dynamic retransmission time,a transmission time is different for each connection and which may be changed during the same connection. Retransmission time can be made(75) by basing it on the round-trip time (RTT). Several formulas are used for this purpose.

A.physical

B.network

C.transport

D.application@@@SXB@@@A.path

B.window

C.response

D.process@@@SXB@@@A.process

B.segment

C.program

D.user@@@SXB@@@A.connections

B.requests

C.acknowledgments

D.datagrams@@@SXB@@@A.long

B.short

C.fixed

D.dynamic

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更多“The TCP protocolis a （71) layer protocol. Each connection connects two TCPs that may be ju”相关的问题

第1题

The country needs _____________ in education.

A、benefit

B、comparison

C、investment

D、absolution

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第2题

阅读理解。????Tom was one of the brightest boys in ...

阅读理解。

Tom was one of the brightest boys in the year, with supportive parents. But when he was 15 he suddenly

stopped trying. He left school at 16 with only two scores for secondary school subjects. One of the reasons

that made it cool for him not to care was the power of his peer (同龄人) group.

The lack of right male (男性的) role models in many of their lives - at home and particularly in the school

environment (环境)-means that their peers are the only people they have to judge themselves against.

They don't see men succeeding in society so it doesn't occur to them that they could make something of

themselves. Without male teachers as a role model, the effect of peer actions and street culture (文化) is all-

powerful. Boys want to be part of a club. However, schools can provide the environment for change, and

provide the right role models for them. Teachers need to be trained to stop that but not in front of a child's

peers. You have to do it one to one, because that is when you see the real child.

It's pointless sending a child home if he or she has done wrong. They see it as a welcome day off to watch

television or play computer games. Instead, schools should have a special unit where a child who has done

wrong goes for the day and gets advice about his problems - somewhere he can work away from his peers

and go home after the other children.

1. Why did Tom give up studying？

A. He disliked his teachers.

B. His parents no longer supported him.

C. It's cool for boys of his age not to care about studies.

D. There were too many subjects in his secondary school.

2. What seems to have a bad effect on students like Tom？

A. Peer groups.

B. A special unit.

C. The student judges.

D. The home environment.

3. What should schools do to help the problem schoolboys？

A. Wait for their change patiently.

B. Train leaders of their peer groups.

C. Stop the development of street culture.

D. Give them lessons in a separate area.

4. A teacher's work is most effective with a schoolboy when he _____.

A. is with the boy alone

B. teaches the boy a lesson

C. sends the boy home as punishment

D. works together with another teacher

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第3题

SECTION A COMPOSITION (35 MIN)

Friendship is forever a topic for human beings. How do you view "friendship"？

Write on ANSWER SHEET TWO a composition of about 200 words on the following topic:

FRIENDSHIP

You are to write in three parts.

In the first part, state specifically what your idea is.

In the second part, provide one or two reasons to support your idea OR describe your idea.

In the last part, bring what you have written to a natural conclusion or a summary.

Marks will be awarded for content, organization, grammar and appropriateness. Failure to follow the instructions may result in a loss of marks.

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第4题

When dopant with valence electrons less than those in the host semiconductor is introduced, the resulting doped system is n-type semiconductor.

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第5题

As far as I see, this book has its own _______.

A、merit

B、signal

C、visible

D、swift

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第6题

4.They could resolve the case by submitting the dispute to arbitration by the American International Trade Arbitration Commission.

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第7题

There are i kinds of ions in a electrolyte solution, so the overall conductance of the solution can be expressed by the following equation:

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第8题

Key James, Secretary of Health and Human Resources in the Virginia State government, loves to turn the tables on those who don&39;t think it&39;s possible to be middle-class,conservative,educated and still be truly black. Once, during an Abortion debate, a woman in the audience angrily told James she was so middle-class she didn&39;t have a clue about real African American life.

"If you understood what these women go through," the woman said, "you would realize that abortion is their only choice. " James then asked the woman to consider a poor black mother on welfare. She already has four children and an alcoholic husband who has all but abandoned the family.

Now she discovers another child is on the way. How would you counsel that woman, asked James. "Have an abortion," the woman responded. "

That child would have a very poor quality of life. " "I have a vested interest in your answer," James said. "The woman I described was my mother. I was the fifth of six children born into poverty. And, in case you&39;re interested,the quality of my life is just fine!"

1、"To move the tables" means__________.

A.to move the tables

B.to carry the tables away

C.to gain courage

D.to gain an advantage after having been at a disadvantage

James' mother__________.A.was educated

B.was conservative

C.was poor

D.A and B

James' father__________.A.divorced his wife

B.liked to drink

C.deserted his family

D.B and C

James' family led a__________life when she was born.A.miserable

B.happy

C.well-off

D.hardly

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第9题

2. Steps are being taken to _____ the accident frequency rate.

A、prevent

B、cut down

C、spur up

D、raise

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