300-425 Question 261
Select 3A retail company is experiencing degraded wireless performance in their store due to suspected RF interference. As a wireless engineer, you are tasked with identifying and managing RF interferers using Cisco tools. Which steps should you take to effectively manage RF interference in this scenario?
- A
Use Cisco's CleanAir technology to identify and classify the source of RF interference.
- B
Manually adjust the transmit power of all access points to the maximum setting to overcome the interference.
- C
Analyze the interference events and affected channels using a spectrum analyzer integrated into the Cisco Wireless LAN Controller (WLC).
- D
Disable all 2.4 GHz access points to eliminate interference from devices operating on the 2.4 GHz band.
- E
Relocate or eliminate the interfering device if it is identified as a non-Wi-Fi interference source.
Show answer and explanation
Correct answers: A, C, E
Explanation
Managing RF interference effectively involves using tools like Cisco CleanAir to identify and classify interference sources, analyzing affected channels using spectrum analysis tools, and addressing the root cause of interference. Steps like increasing AP power or disabling frequency bands are not ideal solutions and could create additional issues. Identifying and resolving the interference source ensures optimal wireless performance.
- A. Correct.
Cisco's CleanAir technology is designed to detect, classify, and mitigate RF interference. This step is critical for identifying the interference source.
- B. Incorrect.
Manually setting all access points to maximum transmit power can lead to co-channel interference, further degrading wireless performance. This is not a best practice for interference management.
- C. Correct.
A spectrum analyzer integrated into the Cisco WLC allows you to analyze RF activity, interference events, and affected channels, which is critical for diagnosing interference issues.
- D. Incorrect.
Disabling all 2.4 GHz access points is not a recommended solution as it could disrupt connectivity for devices relying on that band. Instead, interference should be managed selectively.
- E. Correct.
If a non-Wi-Fi interference source (e.g., a microwave oven or wireless camera) is identified, relocating or eliminating the source is an effective way to manage interference.