200-301 · Question #459
200-301 Question #459: Real Exam Question with Answer & Explanation
The correct answer is B: It is used in place of 802 11b/g when many nonoverlapping channels are required. 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- overlap
Question
What must be considered when using 802:11 ta?
Options
- AIt is compatible with 802 lib- and 802 11-compliant wireless devices
- BIt is used in place of 802 11b/g when many nonoverlapping channels are required
- CIt is susceptible to interference from 2 4 GHz devices such as microwave ovens.
- DIt is chosen over 802 11b/g when a lower-cost solution is necessary
Explanation
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.
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