GSEC · Question #176
Which of the following radio frequencies is used by the IEEE 802.11a wireless network?
The correct answer is D. 5.0 GHz. IEEE 802.11a is a Wi-Fi standard that operates exclusively in the 5 GHz frequency band using OFDM modulation, unlike 802.11b and 802.11g which use the 2.4 GHz band.
Question
Which of the following radio frequencies is used by the IEEE 802.11a wireless network?
Options
- A3.7 GHz
- B7.0 GHz
- C2.4 GHz
- D5.0 GHz
How the community answered
(34 responses)- A15% (5)
- B3% (1)
- C9% (3)
- D74% (25)
Why each option
IEEE 802.11a is a Wi-Fi standard that operates exclusively in the 5 GHz frequency band using OFDM modulation, unlike 802.11b and 802.11g which use the 2.4 GHz band.
3.7 GHz is associated with the 802.11y amendment for licensed long-range outdoor use and is not the standard operating frequency of 802.11a.
7.0 GHz is not a defined frequency band in any standard IEEE 802.11 Wi-Fi specification.
2.4 GHz is the operating frequency for IEEE 802.11b and 802.11g standards, not 802.11a.
IEEE 802.11a, ratified in 1999, uses Orthogonal Frequency Division Multiplexing (OFDM) in the 5 GHz UNII band and supports data rates up to 54 Mbps. The 5 GHz band provides more non-overlapping channels and less interference from consumer devices compared to the congested 2.4 GHz band used by 802.11b and 802.11g.
Concept tested: IEEE 802.11a operating frequency band
Source: https://standards.ieee.org/ieee/802.11a/1165/
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