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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.

Troubleshooting WLAN Performance Issues

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

300-370 question #5 exhibit

Options

  • Acordless phone
  • Bmicrowave oven
  • C2 4 GHz wideband jammer
  • DFHSS Bluetooth
  • Eanalog video camera

How the community answered

(25 responses)
  • C
    4% (1)
  • D
    4% (1)
  • E
    92% (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.

Acordless phone

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.

Bmicrowave oven

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.

C2 4 GHz wideband jammer

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.

DFHSS Bluetooth

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.

Eanalog video cameraCorrect

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

Topics

#Non-802.11 interference#Interference impact#RF jamming

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