A network operations team uses Cisco DNA Center Assurance to monitor wireless network health. They receive an alert indicating 'High Interference' for an access point in a specific area. Which troubleshooting action should the team prioritize first based on this alert?
- AAdjust the transmit power of neighboring access points.
- BCheck the wired uplink utilization of the access point.
- CVerify the DHCP server's availability and response times.
- DInspect the physical environment around the access point for non-Wi-Fi interference sources.
Show answer & explanationAnswer & explanation
Correct answer: D. Inspect the physical environment around the access point for non-Wi-Fi interference sources.
When DNA Center reports 'High Interference', it specifically points to issues with the wireless spectrum. While Wi-Fi devices can interfere with each other (addressed by adjusting transmit power), a common and critical source of 'High Interference' is non-Wi-Fi devices operating in the same frequency bands (e.g., microwaves, cordless phones, Bluetooth devices). Inspecting the physical environment helps identify and mitigate these external sources first, as they often cause persistent and severe interference that cannot be solved by Wi-Fi parameter adjustments alone.
Why the other options are wrong
- A. Adjusting transmit power helps mitigate co-channel interference between Wi-Fi devices, but non-Wi-Fi interference sources often have a more significant and disruptive impact and should be investigated first.
- B. Wired uplink utilization is not directly related to 'High Interference' on the wireless medium.
- C. DHCP server availability relates to client onboarding, not 'High Interference' on the wireless medium.
Wireless Interference Sources
Factors that disrupt wireless signals, categorized as co-channel interference (from other Wi-Fi devices) or non-Wi-Fi interference (from external sources like microwaves or cordless phones).
- Non-Wi-Fi interference can be highly disruptive.
- Spectrum analysis tools help identify interference sources.
- Proper AP placement and power levels mitigate co-channel interference.
Memory trick: Interference? Look around first! Then power, then channels, then DHCP, if it's still hurting, you see.