300-425 · Question #306
Why is the 2.4 GHz band generally avoided in high-density enterprise designs?
The correct answer is C. It has fewer non-overlapping channels and more interference. The 2.4 GHz band is avoided in high-density designs because its limited non-overlapping channels and crowded spectrum cause excessive co-channel interference.
Question
Why is the 2.4 GHz band generally avoided in high-density enterprise designs?
Options
- AIt has more available channels than 5 GHz
- BIt supports only 802.11ac
- CIt has fewer non-overlapping channels and more interference
- DIt requires directional antennas
How the community answered
(36 responses)- B3% (1)
- C92% (33)
- D6% (2)
Why each option
The 2.4 GHz band is avoided in high-density designs because its limited non-overlapping channels and crowded spectrum cause excessive co-channel interference.
2.4 GHz has fewer non-overlapping channels (only 3) than 5 GHz, which is the opposite of what this choice states.
2.4 GHz supports older standards such as 802.11b/g/n, not 802.11ac - 802.11ac operates exclusively in the 5 GHz band.
The 2.4 GHz band has only three non-overlapping channels (1, 6, and 11) in most regulatory domains, compared to the many available in the 5 GHz band. In high-density environments, this forces nearby APs onto the same or adjacent channels, causing co-channel and adjacent-channel interference. Additionally, 2.4 GHz is saturated with interference from Bluetooth devices, microwave ovens, and consumer IoT products, further degrading performance.
Directional antenna requirements are determined by coverage design goals, not by frequency band; omni-directional antennas are commonly used at 2.4 GHz.
Concept tested: 2.4 GHz channel limitations in high-density WLANs
Source: https://www.cisco.com/c/en/us/td/docs/wireless/controller/technotes/8-8/b_wireless_lans_design_guide.html
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