CWT WLAN Installation & Configuration 4 — Questions and Answers
Question 1: A client cannot associate to an AP even though the correct SSID is selected. The technician confirms the passphrase is correct. What should be checked next?
- AP antenna gain
- Client's MAC address and whether MAC filtering is enabled (Correct answer)
- DHCP lease duration
- AP firmware version
Correct answer: Client's MAC address and whether MAC filtering is enabled
If credentials are correct but association fails, MAC address filtering on the AP may be blocking the client.
Question 2: What is the primary role of a RADIUS server in an enterprise WLAN deployment?
- Assign IP addresses to wireless clients
- Authenticate users and authorize network access via 802.1X (Correct answer)
- Provide DNS resolution for wireless clients
- Manage AP firmware upgrades
Correct answer: Authenticate users and authorize network access via 802.1X
A RADIUS server provides centralized authentication, authorization, and accounting (AAA) for 802.1X-based enterprise WLAN security.
Question 3: Which antenna type radiates power equally in all horizontal directions and is commonly used in indoor AP deployments?
- Yagi antenna
- Patch antenna
- Omnidirectional antenna (Correct answer)
- Parabolic dish antenna
Correct answer: Omnidirectional antenna
Omnidirectional antennas radiate RF energy in a 360-degree horizontal pattern and are the standard choice for general indoor coverage.
Question 4: A site survey reveals that channel 6 is used by three neighboring APs in the same area. What is this condition called?
- Adjacent channel interference
- Co-channel interference (Correct answer)
- Hidden node problem
- Near-far problem
Correct answer: Co-channel interference
Co-channel interference occurs when multiple APs use the same channel in the same coverage area, causing contention and performance degradation.
Question 5: In a centralized WLAN architecture, where is client data traffic processed before reaching the wired network?
- At the access point
- At the client's NIC
- At the Wireless LAN Controller (WLC) (Correct answer)
- At the edge firewall
Correct answer: At the Wireless LAN Controller (WLC)
In a centralized (controller-based) architecture, data traffic is tunneled to the WLC, which then forwards it to the wired network.
Question 6: What is the maximum legal EIRP for a point-to-multipoint (PtMP) 5 GHz outdoor link under FCC rules?
- 1 watt (30 dBm)
- 4 watts (36 dBm) (Correct answer)
- 200 milliwatts (23 dBm)
- 10 watts (40 dBm)
Correct answer: 4 watts (36 dBm)
The FCC allows up to 4 watts (36 dBm) EIRP for point-to-multipoint 5 GHz outdoor deployments in the UNII-1 and UNII-3 bands.
Question 7: A technician is deploying APs in a high-density auditorium. Which cell size strategy should be used?
- Maximize cell size with high transmit power to ensure full coverage
- Use small cells with lower transmit power to reduce co-channel interference (Correct answer)
- Deploy only 2.4 GHz APs for maximum compatibility
- Use a single high-gain AP in the center of the room
Correct answer: Use small cells with lower transmit power to reduce co-channel interference
High-density environments benefit from smaller cells with lower transmit power, distributing clients across more APs and reducing interference.
CWT WLAN Installation & Configuration 4
A client cannot associate to an AP even though the correct SSID is selected.
The technician confirms the passphrase is correct.
What should be checked next?