问题 问答题

【问题4】 MIB中的数据可以分为哪三类

答案

参考答案:

解析:MIB中的数据可大体分为三类:感测数据、结构数据和控制数据。MIB是网络管理数据的标准,在这个标准里规定了网络代理设备必须保存的数据项目、数据类型,以及允许在每个数据项目中的操作。其中的数据可以分为三种类型,分别是感测数据、结构数据和控制数据。 感测数据用来表示测量到的网络状态,是通过网络的监测过程获得的原始信息,包括节点队列长度、重发率、链路状态、呼叫统计等。这些数据是网络的计费管理、性能管理和故障管理的基本数据。 结构数据用来描述网络的物理和逻辑结构,相对感测数据来说,结构数据是静态的 (变化缓慢的)网络信息,包括网络拓扑结构、交换机和中继线的配置、数据密钥、用户记录等。这些数据是网络的配置管理和安全管理的基本数据。 控制数据是用来存放网络的操作设置。控制数据代表网络中那些可调整参数的设置,如中继线的最大流、交换机输出链路业务分流比率、路由表等。控制数据主要用于网络的性能管理。

阅读理解

In a world with limited land, water and other natural resources, the harm from the traditional business model is on the rise. Actually, the past decades has seen more and more forests disappearing and globe becoming increasingly warm. People now realize that this unhealthy situation must be changed, and that we must be able to develop in sustainable (可持续的) ways. That means growth with low carbon or development of sustainable products. In other words, we should keep the earth healthy while using its supply of natural resources.

Today, sustainable development is a proper trend in many countries. According to a recent study, the global market for low carbon energy will become three times bigger over the next decades. China, for example, has set its mind on leading that market, hoping to seize chances in the new round of the global energy revolution. It is now trying hard to make full use of wind and solar energy, and is spending a huge amount of money making electric cars and high speed trains. In addition, we are also seeing great growth in the global markets for sustainable products such as palm oil, which is produced without cutting down valuable rainforest. In recent years the markets for sustainable products have grown by more than 50%.

Governments can fully develop the potential of these new markets. First, they can set high targets for reducing carbon emission (排放) and targets for saving and reusing energy. Besides, stronger arrangement of public resources like forests can also help to speed up the development. Finally, governments can avoid the huge expenses that are taking us in the wrong direction, and redirecting some of those expenses can accelerate (加速) the change from traditional model to a sustainable one.

The major challenge of this century is to find ways to meet the needs of growing population within the limits of this single planet. That is no small task, but it offers abundant new chances for sustainable product industries.

小题1: The traditional business model is harmful because of all the following EXCEPT that ______.

A.it makes the world warmer

B.it consumes natural resources

C.it brings severe damage to forests

D.it makes growth hard to continue小题2:What can we infer from Paragraph 2?

A.China lacks wind and solar energy.

B.China is the leader of the low carbon market.

C.High speed trains are a low carbon development.

D.Palm oil is made at the cost of valuable forests.小题3:To fully develop the low carbon markets, government can ______.

A.cut public expenses

B.forbid carbon emission

C.develop public resources

D.encourage energy conservation小题4:We can learn from the last paragraph that businesses have many chances to ______.

A.develop sustainable products

B.explore new natural resources

C.make full use of natural resources

D.deal with the major challenge小题5:What is the main purpose of the passage?

A.To introduce a new business model.

B.To compare two business models.

C.To predict a change of the global market.

D.To advocate (提倡) sustainable development.

阅读理解

阅读理解。

     The world economy has run into a brick wall. Despite countless warnings in recent years about the need

to address a potential hunger crisis in poor countries and an energy crisis worldwide, world leaders failed to

think ahead. The result is a global food crisis. Wheat, corn and rice prices have more than doubled in the past

two years. And oil prices have increased more than three times since the start of 2004. These food-price

increases, combined with increasing energy costs, will slow if not stop economic growth in many parts of the

world and will even affect political stability. Practical solutions to these problems do exist, but we'll have to

start thinking ahead and acting globally.

     Here are three steps to ease the current food crisis and avoid the potential for a global crisis. The first is to

promote the dramatic success of Malawi, a country in southern Africa, which three years ago established a

special fund to help its farmers get fertilizer and seeds with high productivity. Malawi's harvest doubled after

just one year. An international fund based on the Malawi model would cost a mere $10 per person annually in

the rich world, or S10 billion altogether.

     Second, the U.S. and Europe should abandon their policies of paying partly for the change of food into

biofuels. The U.S. government gives farmers a taxpayer-financed payment of 51 cents per gallon of ethanol

(乙醇) changed from corn. There may be a case for biofuels produced on lands that do not produce foods-tree

crops, grasses and wood products-but there's no case for the government to pay to put the world's dinner into

the gas tank.

     Third, we urgently need to weather-proof die world's crops as soon and as effectively as possible. For a

poor farmer, sometimes something as simple as a farm pond-which collects rainwater to be used in dry weather-

can make the difference between a good harvest and a bad one. The world has already committed to

establishing a Climate Adaptation hind to help poor regions climate-proof vital economic activities such as food

production and health care but has not yet acted upon the promise.

1. An international fund based on the Malawi model would ______.

A. cost each of the developed countries $10 billion per year

B. aim to double the harvest in southern African countries in a year

C. decrease the food prices as well as the energy prices

D. give poor farmers access to fertilizer and highly productive seeds

2. With the second step, the author expresses the idea that ______.

A. it is not wise to change food crops into gas

B. it is misleading to put tree crops into the gas tank

C. we should get alternative forms of fuel in any way

D. biofuels should be developed on a large scale

3. Which of the following is true according to the passage?

A. A rain-collecting pond is a simple safeguard against dry weal.

B. A Climate Adaptation Fund has been established to help poor.

C. The world has made a serious promise to build farm ponds.

D. It makes a great difference whether we develop wood products or not.

4. In the passage, the author calls on us to ______.

A. slow down but not to stop economic

B. develop tree crops, grasses and wood products

C. achieve economic growth and political stability

D. act now so as to relieve the global food shortage