200-301 · Question #977
What must be considered when using 802.11a?
The correct answer is D. It is used in place of 802.11b/g when many nonoverlapping channels are required. This question asks about a key characteristic and advantage of the 802.11a wireless standard.
Question
Options
- AIt is chosen over 802.11b when a lower-cost solution is necessary
- BIt is susceptible to interference from 2.4 GHz devices such as microwave ovens
- CIt is compatible with 802.11b- and 802 11g-compliant wireless devices
- DIt is used in place of 802.11b/g when many nonoverlapping channels are required
How the community answered
(51 responses)- A6% (3)
- B2% (1)
- C4% (2)
- D88% (45)
Why each option
This question asks about a key characteristic and advantage of the 802.11a wireless standard.
802.11a equipment was initially more expensive than 802.11b, not a lower-cost solution.
802.11a operates in the 5 GHz band, making it less susceptible to interference from 2.4 GHz devices like microwave ovens, which primarily affect 802.11b/g.
802.11a operates in the 5 GHz band, while 802.11b and 802.11g operate in the 2.4 GHz band; therefore, they are not directly compatible with each other.
802.11a operates in the 5 GHz band, which offers significantly more non-overlapping channels (typically 12 or more) compared to the 2.4 GHz band used by 802.11b/g (which only has 3 non-overlapping channels). This makes 802.11a suitable for environments requiring high density and minimal interference.
Concept tested: 802.11a characteristics and channel allocation
Source: https://www.cisco.com/c/en/us/td/docs/wireless/controller/technotes/80211a_chan_config.html
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