问题 填空题

下表为一个路由器的路由表。如果该路由器接收到一个源IP地址为10.0.0.10、目的IP地址为40.0.0.40的IP数据报,那么它将把此IP数据报投递到______。

要到达的网络 下一路由器
20.0.0.0 直接投递
30.0.0.0 直接投递
10.0.0.0 20.0.0.5
40.0.0.0 30.0.0.7

答案

参考答案:30.0.0.7

解析: 在因特网中,需要进行路由选择的设备一般采用表驱动的路由选择算法。每台需要路由选择的设备保存一张IP选路表(路由表),需要传送IP数据报时,它就查询该表,决定把数据报发往何处。一个路由表通常包含许多(N,R)对序偶,其中N指的是目的网络的IP地址,R是到网络N路径上的“下一个”路由器的IP地址。

阅读理解

In the UK, a group of campaigners(活动家)have declared the last Saturday in November as National Buy Nothing Day. “Our message is clear: shop less, live more!” says organizer Michael Smith. “The challenge is to try simple living for a day. Spend time with family and friends, rather than spending money on them. Anyone can take part, provided they spend a day without spending.”

On Buy Nothing Day, they take to the streets to tackle consumers(消费者). They dress as pigs to symbolize greed(贪婪). They offer to cut up credit cards and hand out shopping bags with the words “another useless thing I don’t need” written on the side. Some hold street parties to show shoppers that it is possible to have fun without spending money. Others go into shops and put notes saying “don’t buy me” inside clothes and shoes.

Some protestors(抗议者) are working against powerful forces. Many retailers(零售商) and manufacturers depend on Christmas sales for most of their profits. Around two thirds of GDP in the West is made up of consumer spending. If this drops, many people will lose their jobs. At least that will make it easier for them to buy nothing.

And there is also the risk that the campaigners will be seen as killjoys, who want to stop people enjoying themselves. “There’s a fun side to this,” says Michael Smith. “To some it’s a protest, but it’s also a street party. We’re not saying that people are bad because they go shopping, but we need get the message across for people to consume wisely. And after we’re finished, we’ll probably go for a drink.”

小题1:Why do a group of people in the UK choose Saturday as National Buy Nothing Day?

A.Because they have enough food at their homes.

B.Because it is the season for shopping.

C.Because they have run out of money at that time.

D.Because it’s popular to live a simple life.小题2:In order to persuade people to stop shopping, the campaigners _____.

A.stop people going out

B.have different ways to make it

C.offer goods to people freely

D.play tricks on consumers小题3:The underlined word “killjoys” in the last paragraph refers to people who _____.

A.ruin the happiness and fun of others

B.get money from shopkeepers

C.bring happiness to others

D.take no interest in shopping小题4:The campaigners started National Buy Nothing Day for the purpose of _____.

A.persuading people to kill time in a different way

B.persuading people to save money

C.persuading people to have more parties

D.persuading people to spend money wisely

多项选择题