200-301 Question #977: Real Exam Question with Answer & Explanation

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.

Submitted by parkjh· Mar 5, 2026Network Access

Question

What must be considered when using 802.11a?

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

Explanation

This question asks about a key characteristic and advantage of the 802.11a wireless standard.

Common mistakes.

A. 802.11a equipment was initially more expensive than 802.11b, not a lower-cost solution.
B. 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.
C. 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.

Concept tested. 802.11a characteristics and channel allocation

Reference. https://www.cisco.com/c/en/us/td/docs/wireless/controller/technotes/80211a_chan_config.html

Topics

#802.11a#Wi-Fi standards#Wireless channels#Frequency bands

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