A clerk's municipal laptop shows poor WLAN performance until a noisy USB 3 hub beside the client is unplugged, after which SNR improves. What does this demonstrate?
Select an answer to reveal the explanation.
Short Explanation
That USB 3 brick can spray hash into the 2.4 GHz neighborhood like static on a phone call. Unplug the noisy neighbor and the SNR smile returns. Sometimes the interferer is sitting on the desk, not in the ceiling.
Full Explanation
Client-local noise sources such as poorly shielded USB 3 devices can raise the noise floor near the NIC and reduce SNR without any AP configuration change. Improved SNR after removing the device confirms a local RF noise performance issue. Technicians should consider desk-side interferers during Domain 5.2 low-SNR troubleshooting. This remains within CWTS technician scope and does not require CWNA-level protocol analysis.