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Certified Wireless Design Professional Questions 51–55 (page: 12)

You are validating client association capabilities to an 802.1X/EAP secure SSID. The RADIUS server's IP address is 10.100.50.25, and the default RADIUS authentication port is being used. None of the clients can associate with the SSID. After verifying that both the server and the RADIUS service are operational, you find that the authenticator (such as the AP or controller) is not communicating properly with the RADIUS server.
What is your next troubleshooting step?

During lunch time in the break room of a company, Wi-Fi connectivity on the 2.4 GHz band becomes intermittent. At other times of the day, it works fine.
What is the most likely cause of this issue?

After deploying a 5 GHz-only WLAN infrastructure in the USA, using 20 MHz channel widths and all 25 available channels, a manager tests the Guest SSID on his 802.11n tablet. During testing, he experiences several areas with poor RSSI (below -80 dBm) or no signal at all. Upon checking, all APs are operational, and coverage was validated post-deployment.
What is the likely cause of this issue?

After designing and deploying a WLAN infrastructure, you notice that co-channel interference (CCI) is causing poor performance in the 2.4 GHz band. Although the WLAN was primarily designed for 5 GHz, 2.4 GHz was included as a best-effort solution. You discover that the implementers did not follow your configuration guidelines.
What can you do to minimize the impact of CCI in the 2.4 GHz band without adding adjacent-channel interference (ACI)?

You have performed a validation site survey after deploying a WLAN infrastructure in an All-Wireless- Office. One specific application is experiencing delays after transitioning from wired to wireless connectivity. During validation, you discover that all APs are using 80 MHz channel widths instead of the designed 20 MHz on the 5 GHz band.
What can be done to resolve the delay for this application?