350-401 Question 180
Single answerYou are an administrator troubleshooting a wireless client connectivity issue in a corporate WLAN. A user reports they are unable to connect to the 'CorpWiFi' SSID. Using the Cisco Wireless LAN Controller (WLC) GUI, you notice the following: the SSID 'CorpWiFi' is configured on the correct APs, the security settings are WPA2 with PSK, and the user’s device is listed under 'Monitor > Clients' but shows a status of 'Authentication Failed.' What is the most likely cause of the connectivity issue?
- A
The wireless client is using an incorrect preshared key (PSK).
- B
The SSID 'CorpWiFi' is not broadcast by the access point.
- C
The WLC has disabled the 'CorpWiFi' SSID due to a configuration error.
- D
The wireless client is using an unsupported Wi-Fi network adapter.
Show answer and explanation
Correct answer: A
Explanation
The most common reason for an 'Authentication Failed' status in the Cisco WLC GUI is a mismatch between the preshared key configured on the client and the WLC. Since the user’s device is listed in the WLC under 'Monitor > Clients,' it has attempted to connect to the SSID. Other options, such as a disabled SSID or unsupported Wi-Fi adapter, would prevent the device from appearing in the client list entirely.
- A. Correct.
An 'Authentication Failed' status typically indicates a mismatch between the preshared key configured on the WLC and the one entered on the client device.
- B. Incorrect.
If the SSID was not broadcast, the client would not even attempt to connect or appear in the client list on the WLC.
- C. Incorrect.
If the SSID was disabled on the WLC, it would not be shown as active, and no clients would attempt to connect.
- D. Incorrect.
An unsupported Wi-Fi network adapter would likely result in the client being unable to detect the SSID or connect at all, not specifically an 'Authentication Failed' status.