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【问题5】 读者小郭的笔记本电脑安装的是Windows XP操作系统，并对无线网卡进行了正确的参数设置。 (1)当他来到无线阅览室访问图书馆内部网数据资源时，可以在操作系统的cmd窗口下运行 (2) 命令进行手工释放IP地址。 (2)当无线阅览室采用Web+DHCP方式解决WLAN接入问题时，小郭可运行 (3) 命令来判断或测试自己的笔记本电脑是否与该无线局域网连通。 (3)当无线阅览室的WLAN采用IEEE802.11b标准时，读者小郭在对自己的笔记本电脑中无线网卡进行配置时(配置界面参见图7-9)，“EncryptionLevel”选项应选择 (4) 协议，该协议支持40位和 (5) 位的密钥。
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【问题2】 请从表7-6中选择合适的AP设备代号，以满足图7-8所示的网络中无线阅览室对无线接入点AP1、 AP2的技术要求。 表7-6 AP设备配置及性能表 设备代号 配置及性能描述 AP_1 1个信道卡扩展槽，1个100BaseTx上联模块，内置定向天线，速率1Mb/s采用DB/SK，速率2Mb/s采用DQPSK，速率5.5/11Mb/s时采用CCK，支持40/128位WEP加密 AP_2 2个信道卡扩展槽(其中已配置1个100BaseTx上联模块)，带全向室外天线，支持IEEE802.11规定的DCF和PCF，在负载环境下速率自动跌落，支持40/128位WEP加密 AP_3 2个信道卡扩展槽(其中已配置1个100BaseTx上联模块)，支持IEEES02.11规定的DCF和PCF，速率1Mb/s采用DB/SK，速率2Mb/s采用DQPSK，速率5.5/11Mb/s时采用CCK，带定向室外天线 AP_4 1个信道卡扩展槽，1个100BaseTx上联模块，内置全向天线，支持40/128位WEP加密，速率1Mb/s采用DB/SK，速率2Mb/s采用DQPSK，速率5.5/11Mb/s时采用CCK
TEXT EThe Pony Express In the United States today, we can send a letter from coast to coast in just a few days for well under half dollar. But news did not always travel as fast or as cheaply as it does today, In the mid 1800s, trains and horse-drawn coaches carded mail. It took many weeks for news to travel from Now York to California. In 1860, the railroad and telegraph reached only from the East Coast to Missouri, less than halfway across the coun try. Horse-drawn coaches, which were very slow, then carried the mail from Missouri to California, In April 1860, the Pony Express began to carry the mail from St. Joseph, Missouri, to Sacramento, California. The trip took just ten days -- half the time the coaches took. The Pony Express was a horse relay system. There were stations every 10 or 15 miles along the route, which was nearly 3,200 kilometers’(2,000 miles) long. Fresh horses were at each station. The riders, with their heavy mailbags, changed horses at every station. They continued riding full speed for a total of about 100 miles. Then another rider look over and continued riding. The Pony Express riders rode through dangerous territory, including mountains, deserts, and Indian lands. Bad weather didn’t stop these tough riders, either. They rode through rain, snow, sleet, and blizzards, both night and day. The riders, therefore, had to be both brave and strong. Some newspapers in 1860 carried this advertisement: Wanted: Young, skinny, wiry fellows, not over 18. Must be expert riders, willing to risk death daily. Orphans preferred. Most of the young Pony Express riders completed the ride successfully. Some of them even became famous for their courage and bravery during difficult rides. What did these young men get paid for their bravery Twenty-five dollars a week. And what was the cost of sending a letter by Pony Express Five dollars a half-ounce in 1860, then reduced to two dollars in 1861. In October 1861, the telegraph reached California. The Pony Express disappeared after this and became a short but exciting chapter in American history. According to the passage, the Pony Express riders ore ______.
Please excuse me if I’’m a little pensive (哀伤的) today. Mark is leaving, and I’’m feeling kind of sad. You probably don’’t know Mark, but you might be lucky enough to know someone just like him. He’’s been the heart and soul of the office for a couple of years, combining exemplary professional skills with a sweet nature and gentle disposition. He’’s never been all that interested in getting credit for the terrific work he does. He just wants to do his job, and to do it superbly well. And now he’’s moving on to an exciting new professional opportunity. It sounds like it could be the chance of a lifetime, and we’’re genuinely, sincerely pleased for him. But that doesn’’t make it any easier to say goodbye to a dear friend and trusted colleague. Life has a way of throwing these curve balls at us. Just when we start to get comfortable with a person, a place or a situation, something comes along to alter the recipe. A terrific neighbor moves away. Someone in the family graduates. A child finds new love and loyalties through marriage. The family’’s principle bread-winner is laid off. Our ability to cope with change and disruption determines, to a great degree, our peace, happiness and contentment in life. But how do we do that Philosophers have considered the question for centuries, and their responses have been varied. According to the author of the Biblical book of Ecclesiastes, comfort can be found in remembering that "to every thing there is a season, and a time to every purpose under heaven." Kahlil Gibran urged his listeners to "let today embrace the past with remembrance, and the future with longing." A friend of mine who works for the government is fond of reminding his fellow bureaucrats that "survivability depends upon adaptability." And then there’’s Chris, the California surf-rat, who once told me that the answer to life’’s problems can be summed up in four words; "Go with the flow." "It’’s like surfing," Chris explained. "You can’’t organize the ocean. Waves just happen. You ride ’’em where they take you, then you paddle back out there and catch the next one. Sure, you’’re always hoping for the perfect wave where you can get, like, you know, totally tubular. But mostly you just take ’’em the way they come. It’’s not like you’’re trying to nail Jell-O (果冻布丁) to a tree, you know" I’’m not exactly sure, but I think Chris was saying that life is a series of events—both good and bad. No matter how deft (熟练的) your organizational skills, there will always be life-influencing factors over which you have no control. The truly successful person expects the unexpected, and is prepared to make adjustments should the need arise—as it almost always does. That doesn’’t mean you don’’t keep trying to make all your dreams come true. It just means that when things come up that aren’’t exactly in your plan, you work around them—and then you move on. Of course, some bumps along the road of life are easier to take than others. A rained-out picnic, for example, is easier to cope with than the sudden death of a loved one. But the principle is the same. "Change, indeed, is painful, yet ever needful," said philosopher Thomas Carlyle. "And if memory have its force and worth, so also has hope." We’’re going to miss Mark, just like you’’ll miss that graduate, that neighbor or that newlywed. But rather than dwell on the sadness of our parting, we’’ll focus on our hopes for a brighter future—for him, and for us. And then we’’ll go out and do everything we can to make that future happen. Until our plans change—again. Chris sums up life’’s problems as "go with the flow" , which means________.
Please excuse me if I’’m a little pensive (哀伤的) today. Mark is leaving, and I’’m feeling kind of sad. You probably don’’t know Mark, but you might be lucky enough to know someone just like him. He’’s been the heart and soul of the office for a couple of years, combining exemplary professional skills with a sweet nature and gentle disposition. He’’s never been all that interested in getting credit for the terrific work he does. He just wants to do his job, and to do it superbly well. And now he’’s moving on to an exciting new professional opportunity. It sounds like it could be the chance of a lifetime, and we’’re genuinely, sincerely pleased for him. But that doesn’’t make it any easier to say goodbye to a dear friend and trusted colleague. Life has a way of throwing these curve balls at us. Just when we start to get comfortable with a person, a place or a situation, something comes along to alter the recipe. A terrific neighbor moves away. Someone in the family graduates. A child finds new love and loyalties through marriage. The family’’s principle bread-winner is laid off. Our ability to cope with change and disruption determines, to a great degree, our peace, happiness and contentment in life. But how do we do that Philosophers have considered the question for centuries, and their responses have been varied. According to the author of the Biblical book of Ecclesiastes, comfort can be found in remembering that "to every thing there is a season, and a time to every purpose under heaven." Kahlil Gibran urged his listeners to "let today embrace the past with remembrance, and the future with longing." A friend of mine who works for the government is fond of reminding his fellow bureaucrats that "survivability depends upon adaptability." And then there’’s Chris, the California surf-rat, who once told me that the answer to life’’s problems can be summed up in four words; "Go with the flow." "It’’s like surfing," Chris explained. "You can’’t organize the ocean. Waves just happen. You ride ’’em where they take you, then you paddle back out there and catch the next one. Sure, you’’re always hoping for the perfect wave where you can get, like, you know, totally tubular. But mostly you just take ’’em the way they come. It’’s not like you’’re trying to nail Jell-O (果冻布丁) to a tree, you know" I’’m not exactly sure, but I think Chris was saying that life is a series of events—both good and bad. No matter how deft (熟练的) your organizational skills, there will always be life-influencing factors over which you have no control. The truly successful person expects the unexpected, and is prepared to make adjustments should the need arise—as it almost always does. That doesn’’t mean you don’’t keep trying to make all your dreams come true. It just means that when things come up that aren’’t exactly in your plan, you work around them—and then you move on. Of course, some bumps along the road of life are easier to take than others. A rained-out picnic, for example, is easier to cope with than the sudden death of a loved one. But the principle is the same. "Change, indeed, is painful, yet ever needful," said philosopher Thomas Carlyle. "And if memory have its force and worth, so also has hope." We’’re going to miss Mark, just like you’’ll miss that graduate, that neighbor or that newlywed. But rather than dwell on the sadness of our parting, we’’ll focus on our hopes for a brighter future—for him, and for us. And then we’’ll go out and do everything we can to make that future happen. Until our plans change—again. According to the author,_______.
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