问题 单项选择题

R1,R2是一个自治系统中采用RIP路由协议的两个相邻路由器,R1的路由表如下图a所示,如果R1收到R2发送的如下图b所示的(V,D)报文后,更新后RI的五个路由表项的距离值从上到下依次为0、4、4、3、2那么、a、b、c、d、e可能的数值依次为()

A.0、5、4、3、2 

B.1、3、4、3、1 

C.2、3、4、1、1 

D.3、4、3、3、1

答案

参考答案:B

解析:

根据R2发送的(V,D) 报文可以看出,由Rl到达目的地址10.0.0.0,30.0.0.0.0和40.0.0.0与内R1再经过R2到达目的地址10.0.0.0.30.0.0.0币¨40.0.0.0的距离并没有缩短,所以这三个距离不变。由R1到目的地址20.0.0.0的距离为5,而R2到该地址的距离为3,所以更新路由表,到20.0.0.0的距离为3+1=4,同理,R1到50.0.0.0的距离更新为2,故选B。

选择题
阅读理解

[1]Although known as an extraordinarily successful businessman, Warren Buffet comes off as a pretty ordinary person.

[2]Looking back on his childhood, one can see how serious he was about making money. Buffet used to go door-to-door and sell soda pop. Later, he also worked at his grandfather’s grocery store. At the ripe age of 11, Buffet bought his first stock(股票). When his family moved to Washington D.C., Buffet became a paperboy for The Washington Post. While still in school, he was making $175 a month, a full-time wage for many young men.

[3]From the beginning, Buffet made his fortune from investing. He started with all the money that he had made from selling pop, delivering papers and so on. Between 1950 and l956, he grew his $9, 800 to $14, 000.From there, he organized investment partnerships with his family and friends, and then gradually drew in more people through very attractive terms.

[4]Buffet applied to Harvard Business School but         , making it to be one of the worst admission decisions in Harvard history. The outcome ended up affecting Buffet’s life deeply, for he ended up attending Columbia Business School, where he studied under Benjamin Graham, the father of securities analysis who provided the foundation for Buffet’s grand success.

[5]Buffet is a person of habit—same house, same office, same city. He doesn’t collect houses or cars or works of art, and he hates companies that waste money on such goods. Instead, he has established the Buffet Foundation, with a detailed plan on how to invest his money more wisely to society.

小题1:What kind of person is Buffet according to Paragraph 1? (no more than 10 words)

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小题2:What does the writer intend to tell us in Paragraph 2? (no more than 10 words)

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小题3:According to Paragraph 3, how did Buffet start his investment? (no more than 10 words)

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小题4:Fill in the blank in Paragraph 4 with proper words. (no more than 3 words)

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小题5:Explain the underlined sentence in Paragraph 5.(no more than 10 words)

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