Free PW0-100 Exam Braindumps (page: 24)

Page 24 of 151

Which if these will be the most susceptible to multipath
interference?

  1. 1 Mbps DSSS
  2. 5 Mbps FHSS
  3. 11 Mbps DSSS
  4. 1 Mbps FHSS

Answer(s): C

Explanation:

DSSS is the most susceptible to multipath interference, also as transmission rates frames are less resistant to corruption.
See http://www.wi-fiplanet.com/tutorials/article.php/1121691 For Explanation as to why DSSS is most susceptible.
See CWNA Official Study Guide, 3rd Edition, Page 389
For Explanation as to Dynamic Rate Selection



Which of the following are true of FHSS?

  1. FHSS is affected by RF interference to a lesser degree than DSSS.
  2. FHSS used the entire 2.4 GHz ISM band.
  3. FHSS uses frequency diversity to retransmit lost packets on different frequencies.
  4. FHSS is very susceptible to interference from Bluetooth systems.

Answer(s): A,B



After 8/31/00, which of the following are true of FHSS?

  1. Avoids multipath interference.
  2. Hops to different frequencies to avoid attenuation.
  3. Must use a minimum of 15 hops.
  4. Cannot use a hop pattern of more than 40 hops.

Answer(s): C



What is the maximum transmitter output allowed by the FCC for radio transmitters utilizing FHSS technology (>50 hopping channels) in any of the ISM bands?

  1. 4 Watts
  2. 30 dBm
  3. 100 mW
  4. 27 dBm
  5. 125 mW

Answer(s): E

Explanation:

According to the study guide, in pre-08/31/00 rules, the maximum tranmitter output was 1 watt. However, in post-08/31/00 rules, the transmitter output was reduced to 125 mW, for all systems utilizing fewer than 75 hops in a sequence. Since the question asks for output for >50 hops, then I presume the answer should be 125 mW.



Page 24 of 151



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