By Edward William Elgar

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8). This is known as super refraction. Other refraction phenomena, such as ducting or bending, can also occur. Ducting happens when radio waves are trapped in a high-density duct between two areas of lower density. Bending is similar to super refraction, but is not caused by atmospheric conditions related to day or night. Instead, differences in air density in a horizontal plane, like cooler air over a lake or field and warmer air over a shore or highway, cause the radio waves to bend in the direction of the cooler, denser air over the lake or field.

9 inches. 5 inches. 25 of an inch. com 13 14 Chapter 1 • Wired versus Wireless and Wireless-aware LANs wireless system; however, in a 23 GHz system, the wavelength is reduced to half by this rain. At this size, the rain or snow becomes a reflective surface and disperses the 23 GHz signal. In most cases, the effects of fog are considered to be much the same as rain. However, fog can adversely affect the radio link when it is accompanied by atmospheric conditions such as temperature inversion, or very still air accompanied by stratification (layers of significantly differing air temperatures).

With the Cisco wireless-aware LAN framework, rogue APs can be automatically detected, located, and disabled with minimal intervention of the network administrator. The Cisco wireless-aware framework makes finding these rogue APs easy due to its new RF scanning and monitoring features. This is a break from traditional manual scanning and actually goes far above and beyond automated scanning as it includes data input from the client wireless adapters as well as authorized APs. Because of this feature, a much wider physical range is covered in the scanning, so chances of finding rogue APs in “dead zones” is greatly improved.

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