CWT Troubleshooting & Maintenance Procedures 3

Question 1

A WLAN controller shows an AP in 'discovery' state and it never transitions to 'joined.' What should you verify first?

Accepted Answer

That the AP can reach the WLC IP address and UDP port 5246/5247 are open

Answer

CAPWAP control traffic uses UDP 5246/5247, and if these ports are blocked the AP cannot join the WLC.

Question 2

A client can connect to the WLAN but cannot reach the internet. Other clients on the same SSID work fine. What is the most likely cause?

Accepted Answer

The client has an incorrect IP address or DNS configuration

Answer

If other clients on the same SSID work, the issue is client-specific—most likely an incorrect IP, subnet mask, gateway, or DNS setting.

Question 3

During a post-installation walkthrough, you notice dead spots in areas predicted to have coverage. What is the most common cause?

Accepted Answer

Obstructions not accounted for in the predictive site survey

Answer

Predictive surveys use building blueprints that may not reflect actual RF-attenuating materials like dense walls, metal shelving, or HVAC ducts.

Question 4

Which log entry on a wireless controller most directly indicates a rogue AP has been detected?

Accepted Answer

Rogue AP containment initiated for BSSID XX:XX:XX:XX:XX:XX

Answer

A rogue AP containment log entry directly confirms the controller's WIDS/WIPS has identified and is responding to an unauthorized AP.

Question 5

A technician performs a packet capture and sees many 802.11 Probe Request frames but few Probe Responses. This suggests:

Accepted Answer

The AP is overloaded and dropping management frames

Answer

If an AP is heavily loaded or experiencing resource exhaustion, it may fail to respond to client probe requests in a timely manner.

(CWT) Certified Wireless Technician Practice Test