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D is correct The key to the question is that it asks for the percentage that may be blocked and not that which must be clear Since 60 percent must be clear, 40 percent may be blocked A, B, and C are incorrect If 80 or 60 percent of the first Fresnel zone is blocked, connections will be impossible or unstable Ideally only 20 percent of the first Fresnel zone will be blocked, but the question asked for the maximum allowed percentage of blockage
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4 You are implementing a WLAN within a building The building is less than 2000 square feet, and there are very few internal walls How much of the first Fresnel zone should have clearance for this network to operate smoothly A Eighty percent of the first Fresnel zone should be clear B The Fresnel zones are not as important for indoor networks due to the propagation behaviors of WLAN signals C Sixty percent of the first Fresnel zone should be clear D One hundred percent of the first Fresnel zone must be clear for indoor WLANs
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B is correct Indoor WLANs are not as impacted by first Fresnel zone issues, since reflection, refraction, and diffraction help the signals to propagate to many areas of the indoor facility A, C, and D are incorrect All of these answers are incorrect, since the Fresnel zones are not usually considered for coverage-based WLANs as opposed to bridge links
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5 Which of the following is a valid definition of Fresnel zones A Ellipse-shaped areas around the visual line of sight in an RF link B Parallel lines that run along the visual line of sight in an RF link C The donut-shaped area around an antenna that provides WLAN coverage D The width of the transmitting RF beam at the point of half power
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A is correct A Fresnel zone, named for physicist Augustin-Jean Fresnel, is one of a (theoretically infinite) number of concentric ellipsoids that define volumes in the radiation pattern of an RF link B, C, and D are incorrect These definitions are not proper definitions of Fresnel zones
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6 An access point is generating 50 mW of output power The cables and connectors leading up to the antenna introduce 6 dB of loss The signal strength has weakened What is the difference between the original signal power level and the resulting power level called when the signal is weakened A Gain B Loss
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C Impedance D Reflection
B is correct This difference in signal strength is called loss when the resulting signal is weaker than the original signal A, C, and D are incorrect The difference is known as gain when the resulting signal is stronger than the original signal Impedance is a reference to the resistance imposed by a cable or connector The impedances of different cables and connectors in a system should match Reflection is what occurs when RF waves hit large smooth surfaces
7 What causes loss A Amplification B Attenuation C Augmentation D Aggravation
B is correct Attenuation causes loss A, C, and D are incorrect Amplification causes gain Augmentation may cause gain, but it is not the normal term Aggravation just causes, well, aggravation
8 You have implemented a WLAN link between two buildings that are about 180 feet apart The space between the buildings is completely free of objects The antennas are mounted high enough that the first Fresnel zone has zero blockage The link still loses power between the transmitting and receiving antenna What is causing this A Diffraction B Reflection C Free space path loss D Absorption
C is correct Free space path loss impacts any link regardless of Fresnel zone clearance Free space path loss occurs more because of the spreading of the wave front than the absorption of energy by the moisture in the air Significant precipitation levels would be needed to absorb measurable RF energy in this short link A, B, and D are incorrect Since the path between the two antennas has zero Fresnel zone blockage, no diffractions or reflections should have an impact on the signal strength at the receiver There are no materials between the transmitter and the receiver that could absorb significant RF energy
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