If no obstacles are intruding more than 20% into the Fresnel Zone what type of Line of Sight exists?
Answer(s): A
In radio communications, a Fresnel zone (pronounced as FRA-nel Zone) is one of a (theoretically infinite) number of a concentric ellipsoids of revolution which define volumes in the radiation pattern of a (usually) circular aperture. Fresnel zones result from diffraction by the circular aperture.The cross section of the first Fresnel zone is circular. Subsequent Fresnel zones are annular incross section, and concentric with the first.The concept of Fresnel zones may also be used to analyze interference by obstacles near the path of a radio beam.This Zone must be determined first, so as to keep it free from obstructions.Maximum Obstruction allowable is: 40%Recommended Obstruction is: 20%For establishing Fresnel Zone first we must determine the RF Line of Sight (RF LoS), which in simple terms is a straigt line between the transmitting and receiving Antenna. Now the zone surrounding the RF LoS is said to be the Fresnel Zone.
http://en.wikipedia.org/wiki/Fresnel_zone
What wireless LAN device management method is NOT used by wireless LAN manufacturers?
Answer(s): F
Page 231 in CWNA Study Guide 3rd edition
When there is an increase in the gain of an antenna, there is also a corresponding increase in which of the following?
Answer(s): B
Although an increase in gain of an omni-directional antenna would correspond to an increase in "'polarization radius" or horizontal range, we believe the answer that is more correct would be range. A high gain, highly-directional parabolic dish antenna would have a long distance range, however the "polarization radius" is really non-existent due to the directionality of the parabolic dish antenna.See CWNA Offical Study Guide, 3rd Edition, page 86 (Highly, directional antenna (Usage))
What 802.11 technology must be used to co-locate five (5) non-interfering access points?
CWNA Official Study Guide, 3rd Edition, Page 208 (Co-Location) Note:The two major problems with 2.4 GHz systems are the limited amount of radio spectrum available and the potential for interference from other users. The FCC has allocated 83.5 MHz of radio spectrum to the ISM band, and as each 802.11b WLAN channel requires roughly 25 MHz, only three non-interfering channels can be accommodated. To provide interoperability with 802.11b systems, 802.11g uses the same three channels. The answer is 802.11a that operates in the less congested 5 GHz band, and it will quickly become the preferred option for commercial users. In the US, the 5 GHz Unlicensed National Information Infrastructure (U-NII) band was initially allocated 300 MHz of non-contiguous bandwidth between 5.150 and 5.585 GHz supporting 12 non-interfering channels.http://www.wsta.org/publications/articles/0804_article02.html
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