300-370 · Question #5
Refer to the exhibit. An engineer is troubleshooting non-802.11 interference and observes the shown output. Which interference signature is the most harmful to Wi-Fi?
The correct answer is E. analog video camera. When troubleshooting non-802.11 interference, an analog video camera is typically considered the most harmful signature to Wi-Fi due to its continuous, high-power, fixed-frequency transmission.
Question
Refer to the exhibit. An engineer is troubleshooting non-802.11 interference and observes the shown output. Which interference signature is the most harmful to Wi-Fi?
Exhibit
Options
- Acordless phone
- Bmicrowave oven
- C2 4 GHz wideband jammer
- DFHSS Bluetooth
- Eanalog video camera
How the community answered
(25 responses)- C4% (1)
- D4% (1)
- E92% (23)
Why each option
When troubleshooting non-802.11 interference, an analog video camera is typically considered the most harmful signature to Wi-Fi due to its continuous, high-power, fixed-frequency transmission.
Cordless phones are problematic but often employ frequency hopping or operate with lower power, causing intermittent and localized interference rather than constant, wide-ranging disruption.
Microwave ovens generate very strong interference but are pulsed and typically operate for short durations, allowing Wi-Fi to sometimes recover during their inactive periods.
A 2.4 GHz wideband jammer is highly disruptive as it blankets a wide range of frequencies, but analog video cameras are often considered more consistently detrimental due to their fixed-frequency, continuous wave nature.
FHSS Bluetooth devices use frequency hopping and relatively low power, designed to coexist with Wi-Fi, making their impact generally less severe than strong, continuous interferers.
Analog video cameras operating in the 2.4 GHz band are often cited as the most harmful non-802.11 interferers because they typically transmit continuously at a fixed frequency and high power. This effectively saturates a Wi-Fi channel (or channels), making them completely unusable for 802.11 communication for extended periods.
Concept tested: Cisco CleanAir non-802.11 interferer impact assessment
Source: https://www.cisco.com/c/en/us/support/docs/wireless/aironet-access-points/113693-wlan-troubleshoot-24ghz.html
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