What must be considered when using 802.11a?
- A. It is compatible with 802 lib- and 802 11-compliant wireless devices
- B. It is used in place of 802 11b/g when many nonoverlapping channels are required
- C. It is susceptible to interference from 2 4 GHz devices such as microwave ovens.
- D. It is chosen over 802 11b/g when a lower-cost solution is necessary
Correct Answer: B
Explanation/Reference: 802.11a and 802.11b are not compatible since 802.11a operates at the 5GHz frequency band and 802.11b operates at the 2.4GHz band. The 2.4 GHz frequency band with a channel width of 22 MHz only has 3 non-overlapping channels (1, 6 and 11) whereas the 5 GHz band has 23 non-overlapping channels with a 20 MHz channel width. Therefore, 802.11a is preferred over 802.11b and 802.11g when many non-overlapping channels are required since they both operate at 2.4GHz unlike 802.11a.
Exam with this question: CA201
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