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CWNA®: Certified Wireless Network Administrator Official Study Guide by David A. Westcott, David D. Coleman

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Answers to Assessment Test

  1. A, C. The IEEE 802.11-2007 standard defines communication mechanisms at only the Physical layer and MAC sublayer of the Data-Link layer of the OSI model. For more information, see Chapter 1.

  2. C. WMM-PS helps conserve battery power for devices using Wi-Fi radios by managing the time the client device spends in sleep mode. Conserving battery life is critical for handheld devices such as barcode scanners and VoWiFi phones. To take advantage of power-saving capabilities, both the device and the access point must support WMM Power Save. For more information, see Chapter 1.

  3. A. A 750 KHz signal has an approximate wavelength of 1,312 feet, or 400 meters. A 252 GHz signal has an approximate wavelength of less than 0.05 inches, or ...

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