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cwna certified wireless network administrator official study guide phần 6

16. "ISM" là viết tắt mà một trong những điều sau đây? A. Quốc tế khoa học đo lường BC tiêu chuẩn quốc tế Các nhà sản xuất tiêu chuẩn công nghiệp máyMà một trong những điều sau đây định nghĩa các từ viết tắt "UNII"? A. Thông tin quốc gia không có giấy phép sáng chế BC không có giấy phép thông tin quốc gia cơ sở hạ tầng | 163 Chapter 6 - Wireless LAN Organizations and Standards 16. ISM stands for which one of the following A. International Scientific Measurement B. International Standards Makers C. Industrial Standard Machine D. Industrial Scientific and Medical 17. Which one of the following does NOT specify equipment that uses the 2.4 GHz ISM band A. 802.11 B. 802.11a C. 802.11b D. 802.11g E. 802.1x 18. Which one of the following defines the acronym UNII A. Unlicensed National Information Invention B. Unlicensed National Information Infrastructure C. Unlicensed Nominal Information Infrastructure D. Unlicensed National Innovation Infrastructure 19. Which one of the following is the key standards maker for most information technology arenas in the United States A. WECA B. FCC C. IEEE D. WLAN A E. IrDA 20. Which one of the following was the FIRST IEEE standard describing the operation of wireless LANs A. 802.11 B. 802.11a C. 802.11b D. 802.11g CWNA Study Guide Copyright 2002 Planet3 Wireless Inc. Chapter 6 - Wireless LAN Organizations and Standards 164 Answers to Review Questions 1. D. The 802.11 standard specifies data rates for FHSS DSSS and infrared technologies. The two speeds specified by the 802.11 standard are 1 Mbps and 2 Mbps. Speeds for DSSS were thereafter amended with the 802.11b standard to add both 5.5 11 Mbps speeds. 2. A. Each of the three 5 GHz UNII bands are exactly 100 MHz wide. The lower band ranges from 5.15 - 5.25 GHz. The middle band ranges from 5.25 - 5.35 GHz. The upper band ranges from 5.725 - 5.825 GHz. 3. A B. The FCC mandates which frequencies may be used for what purposes. They specify which frequency bands will be licensed or unlicensed and they specify the maximum output power within each frequency band. 4. B C. Note that the most popular ISM band in use today is the 2.4 GHz ISM band not the 2.4 MHz ISM band. There are three ISM bands specified by the FCC. The first is the 902 - 928 MHz band. The second is the 2.4000 - 2.5000 GHz band and the third is