Practice Quiz

CWNA Wireless Network Administrator - Question List

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21. Why are DSSS channels more susceptible to narrowband interference than FHSS channels?
  1. A DSSS channel is much larger and wider.
  2. FHSS systems only use one frequency at a time, so the narrowband interference must be on the same exact frequency at the same time.
  3. Information is transmitted one frequency at a time instead of simultaneously transmitting over the entire band.
  4. FHSS systems simply avoid the frequency on which narrowband interference occurs.
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22. Which of the following aspects is not described by the IEEE and OpenAir standards regarding FHSS systems?
  1. Allowable levels of interference
  2. Frequency bands that may be used
  3. Hop sequences
  4. Dwell times
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23. Which of the following is true regarding some FHSS systems that operate at 2.4 GHz and a speed of 3 Mbps?
  1. IEEE 802.11 compliancy
  2. Non-interoperable with other FHSS systems
  3. OpenAir compliancy
  4. Backward compatibility with 900 MHz systems
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24. Which of the following can you use to increase the throughput in an FHSS system?
  1. Shortening the dwell time and lengthening the hop time
  2. Shortening the dwell time and shortening the hop time
  3. Lengthening the dwell time and shortening the hop time
  4. Lengthening the dwell time and lengthening the hop time
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25. Which of the following best defines a noise floor?
  1. The noise generated as a result of foot traffic
  2. The level of RF noise in the wireless LAN environment
  3. A fixed level of noise of -100 dBm in a wireless LAN
  4. The level of noise at which a wireless LAN starts working
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