问题 问答题

【问题1】 双绞线可以制作成直连线和交叉线两种形式,在图3-12所示的拓扑结构中,交换机与路由器(Router)相连的双绞线应制作成什么形式

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解析:直连线这是一道要求读者掌握直连线和交叉线应用环境的实践操作题。本题的解答思路如下。 1)通常将两端RJ-45头均按EIA-568B(或EIA-568A)线序制作成的双绞线称为直连线,适用于网卡与非网卡设备之间的互连场合,例如工作站与交换机、交换机与路由器等场合。在图3-12所示的拓扑结构中,由于路由器(Router)的快速以太网接口Fastethernet 0/0等价一张网卡,因此交换机与路由器 (Router)相连的双绞线应制作成直连线的形式。 2)通常将一端RJ-45头按EIA-568B(或EIA-568A)线序制作,而另一端RJ-45头按EIA-568A(或 EIA-568B)线序制作成的双绞线称为交叉线,适用于两张网卡或两台相同网络设备电接口之间的互连场合,例如两台交换机的UPLINK口之间的互连、两台路由器以太网接口之间的互连、两台主机之间的互连等场合。

阅读理解

On Jan 23, 2012, I was aboard a ship on the Yangtze River, listening to the sound of fireworks and eating plate after plate of dumplings.

On Sunday Feb 10, 2013, I was preparing to celebrate Chinese New Year again – in London’s Chinatown.

It was raining. It was cold. But ever since I left Beijing in August, I had promised myself I would celebrate Chinese New Year – if only to help with my Beijing “homesickness”.

Central London was dressed up for the occasion. There was a stage for a big fireworks display for the evening. Even so, it wasn’t like my real Beijing chunjie.

Even buying a baozi didn’t cheer me up. It cost about 10 times as much as the real thing does in Beijing and got stuck to its rain-ruined paper bag.

Cold, wet and depressed, I ran into a shop for shelter. Suddenly, there it was. Between the packets of dried meat and fish, the bags of rice and the smell of dried noodles in this little Chinese supermarket, I had found home.

An hour later, I hurried into my house with bags of frozen jiaozi, packets of sauce and a large bottle of vinegar. I boiled water, tore open the packets, grabbed my chopsticks and settled down to a feast. This, I thought, is a Happy Chinese New Year.

I even watched the fireworks on TV. After all, why face the British weather when I can bring China home in one bite?

小题1: We can conclude from the first three paragraphs that the author ______.

A.likes watching fireworks on the boat

B.misses Chinese food more than anything else

C.finds it great fun to celebrate Chinese New Year

D.misses her life in Beijing very much小题2:How did the author feel when she found some Chinese foods in a supermarket?

A.a little curious

B.rather tired

C.a bit comfortable

D.very depressed小题3:Why did the author watch the fireworks on TV?

A.She didn’t want to get wet and cold again.

B.The square is far away from where she lives.

C.She doesn’t like fireworks very much.

D.She was too hungry to go out.小题4:What is the best title of the passage?

A.Unforgettable Chunjie in Beijing

B.Wonderful Experience in Britain

C.Finding Home in London

D.Festival in London

问答题 简答题