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300-370 · Question #4

Refer to the exhibit. An engineer is troubleshooting non-802 11 interference and observes this output. Which type of interference signatures can be identified?

The correct answer is B. two healthy CCK and one malformed OFDM. Based on the observed CleanAir output for non-802.11 interference troubleshooting, the identifiable signatures include two healthy CCK signals and one malformed OFDM signal, indicating issues within the 802.11 domain itself.

WLAN Troubleshooting Methods

Question

Refer to the exhibit. An engineer is troubleshooting non-802 11 interference and observes this output. Which type of interference signatures can be identified?

Exhibit

300-370 question #4 exhibit

Options

  • Aone frequency hopping Bluetooth
  • Btwo healthy CCK and one malformed OFDM
  • Cthree broadband jammers
  • Dtwo strong microwave ovens and one moderate

How the community answered

(24 responses)
  • A
    4% (1)
  • B
    75% (18)
  • C
    4% (1)
  • D
    17% (4)

Why each option

Based on the observed CleanAir output for non-802.11 interference troubleshooting, the identifiable signatures include two healthy CCK signals and one malformed OFDM signal, indicating issues within the 802.11 domain itself.

Aone frequency hopping Bluetooth

While CleanAir can detect Bluetooth, stating 'one frequency hopping Bluetooth' is too specific and does not align with the general description of identifiable signatures that would typically include 802.11 signal health.

Btwo healthy CCK and one malformed OFDMCorrect

Cisco CleanAir technology can analyze and report on the quality and characteristics of 802.11 signals in addition to identifying non-802.11 interferers. Signatures like 'healthy CCK' and 'malformed OFDM' indicate the presence and state of 802.11 modulation types, helping to diagnose performance issues, potentially caused by external interference or poor RF design.

Cthree broadband jammers

Although CleanAir identifies jammers, specifying 'three broadband jammers' is too prescriptive and does not match the broad capability of CleanAir to also report on 802.11 signal integrity.

Dtwo strong microwave ovens and one moderate

While CleanAir can detect microwave ovens, stating 'two strong microwave ovens and one moderate' is too specific and does not encompass the full range of interference signatures, including 802.11 signal conditions, that CleanAir can identify.

Concept tested: Cisco CleanAir 802.11 signal quality analysis

Source: https://www.cisco.com/c/en/us/products/collateral/wireless/aironet-access-points/white_paper_c11-609384.html

Topics

#RF spectrum analysis#Interference identification#802.11 signals

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