CWT WLAN Installation & Configuration 5 — Questions and Answers
Question 1: Which protocol does a CAPWAP-based access point use to communicate with a Wireless LAN Controller?
- LWAPP over TCP port 443
- UDP ports 5246 (control) and 5247 (data) (Correct answer)
- TCP port 8080 for all traffic
- GRE tunneling over IP protocol 47
Correct answer: UDP ports 5246 (control) and 5247 (data)
CAPWAP uses UDP port 5246 for the control channel and UDP port 5247 for the data channel between AP and WLC.
Question 2: What is the purpose of 802.11k in a wireless network?
- Enable faster encryption key exchange
- Provide neighbor reports to help clients make better roaming decisions (Correct answer)
- Increase maximum channel bandwidth to 160 MHz
- Define QoS traffic categories for wireless media
Correct answer: Provide neighbor reports to help clients make better roaming decisions
802.11k (Radio Resource Management) enables APs to provide clients with neighbor AP reports, improving roaming decisions and efficiency.
Question 3: An AP is drawing power from an 802.3af PoE switch port but fails to power on. What is the most likely cause?
- The AP requires 802.3at (PoE+) power and exceeds the 802.3af 15.4W budget (Correct answer)
- The Ethernet cable is too long at 80 meters
- The AP requires a static IP address to boot
- The SSID is not configured on the controller
Correct answer: The AP requires 802.3at (PoE+) power and exceeds the 802.3af 15.4W budget
802.3af provides up to 15.4W, while higher-end APs require 802.3at (PoE+) which provides up to 30W; a mismatch prevents the AP from booting.
Question 4: Which Wi-Fi Alliance certification program replaced WPA2 and introduced SAE (Simultaneous Authentication of Equals)?
- WPA3 (Correct answer)
- Wi-Fi 6E
- Wi-Fi CERTIFIED n
- WPA-Enterprise
Correct answer: WPA3
WPA3 replaced WPA2 and introduced SAE, which provides stronger password-based authentication and forward secrecy.
Question 5: A wireless network is experiencing slow performance because many legacy 802.11b clients are connected. What feature can the administrator enable to improve performance for newer clients?
- Enable 802.11d country codes
- Enable minimum basic rate and disable lower data rates like 1 and 2 Mbps (Correct answer)
- Increase the beacon interval
- Disable SSID broadcast
Correct answer: Enable minimum basic rate and disable lower data rates like 1 and 2 Mbps
Disabling low legacy data rates (1, 2, 5.5 Mbps) forces slower clients off the network or to connect less frequently, reducing airtime overhead.
Question 6: What is the primary function of BSS Coloring introduced in 802.11ax?
- Assign visual color codes to SSID broadcast labels
- Reduce unnecessary channel contention by identifying overlapping BSS transmissions (Correct answer)
- Enable multi-color LED status indicators on APs
- Prioritize colorblind-accessible network naming conventions
Correct answer: Reduce unnecessary channel contention by identifying overlapping BSS transmissions
BSS Coloring marks frames with a color identifier so devices can distinguish between transmissions from their own BSS and neighboring BSSs, reducing unnecessary backoff.
Question 7: During AP installation, a technician uses a spectrum analyzer and sees a strong, consistent signal across the 2.4 GHz band. What is the most likely source?
- A Bluetooth headset
- A microwave oven in operation (Correct answer)
- An 802.11n client device
- A cordless DECT phone
Correct answer: A microwave oven in operation
Microwave ovens emit broadband interference across much of the 2.4 GHz band when in operation, affecting all 2.4 GHz channels.
CWT WLAN Installation & Configuration 5
Which protocol does a CAPWAP-based access point use to communicate with a Wireless LAN Controller?