Focusing the antenna lobe in a desired direction caused an increase in the distance a propagated RF wave will travel. What term defines this effect?
Answer(s): D
Antennas have passive gain, which means they do not increase the power that is input into them, but rather shape the radiation field to lengthen or shorten the distance the propagated wave will travel. The higher the antenna gain, the farther the wave will travel, concentrating its output wave more tightly so that more of the power is delivered to the destination (the receiving antenna) at long distances.
CWNA Official Study Guide, Page 142
What is the VSWR value that indicates a perfect impedance match between an antenna and the attached cable?
Answer(s): B
VSWR is a ratio, so it is expressed as a relationship between two numbers. A typical VSWR value would be 1.5:1. The two numbers relate the ratio of impedance mismatch against a perfect impedance match. The second number is always 1, representing the perfect match, where as the first number varies. The lower the first number (closer to 1), the better impedance matching your system has. For example, a VSWR of 1.1:1 is better than 1.4:1. A VSWR measurement of 1:1 would denote a perfect impedance match and no voltage standing wave would be present in the signal path.
CWNA Official Study Guide, Page 53
What organization currently creates wireless LAN operational standards?
Answer(s): A
It is the job of the IEEE to create standards of operation within the confines of the regulations created by the FCC. The IEEE and OpenAir standards regarding FHSS systems describe:1. what frequency bands may be used2. hop sequences3. dwell times4. data rates
CWNA Official Study Guide, Page 80
Which of the following conversions may be necessary when performing wireless LAN mathematical calculations?
This equation can be manipulated to reverse the conversion, now converting dBm to mW:Most of the power levels referred to by administrators will be in mW or dBm. These two units of measurement both represent an absolute amount of power and are both industry standard measurements.
CWNA Official Study Guide, Page 61
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