220-801 Question #806: Real Exam Question with Answer & Explanation

The correct answer is A: Cordless phones. Cordless phones and microwaves both operate in the 2.4GHz frequency band, which directly overlaps with 802.11b/g/n Wi-Fi, causing significant radio frequency interference.

Question

A client states they are receiving poor signal strength on their wireless Internet connection. Which of the following is MOST likely causing the interference? (Select TWO).

Options

ACordless phones
BDrywall
CAccess points
DMicrowaves
EFluorescents lights

Explanation

Cordless phones and microwaves both operate in the 2.4GHz frequency band, which directly overlaps with 802.11b/g/n Wi-Fi, causing significant radio frequency interference.

Common mistakes.

B. Drywall causes signal attenuation and reduced range through physical absorption, not radio frequency interference in the traditional sense.
C. Access points are intentional parts of the wireless network and do not cause interference to their own associated clients under normal conditions.
E. Fluorescent lights emit some electromagnetic noise but are not a primary or well-documented cause of significant 2.4GHz Wi-Fi interference compared to cordless phones and microwaves.

Concept tested. 2.4GHz wireless interference sources

Reference. https://www.cisco.com/c/en/us/support/docs/wireless-mobility/wireless-lan-wlan/82463-troubleshoot-rf-interference.html

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