CWNA WLAN Troubleshooting Quiz

1. Which of the following best describes the purpose of CCA (Clear Channel Assessment)?

To detect if the channel is idle before transmitting

To encrypt wireless communications

To assign IP addresses to clients

To boost access point transmit power

2. What does the term 'channel bandwidth' refer to in WLAN context?

The width of the frequency spectrum occupied by a single channel

The total number of clients supported by an AP

The encryption strength of the network

The maximum distance coverage of a WLAN

3. A client reports slow file transfers over WLAN. Which diagnostic step is most appropriate?

Check data rate negotiation and verify no interference sources

Immediately upgrade to 802.11ax

Disable IPv6 on all devices

Replace the access point antenna

4. Which of the following best describes 'Adjacent Channel Interference'?

Interference from APs on nearby channels reducing throughput

Interference only affecting the 2.4 GHz band

Interference caused by client device firmware

Interference eliminated by WPA3 encryption

5. What is the primary function of a wireless packet sniffer in WLAN troubleshooting?

Capture and analyze wireless frames for protocol issues

Block unauthorized access points

Automatically repair network connections

Increase wireless signal strength

6. A WLAN experiences intermittent connectivity in a warehouse with metal shelving. What is the likely culprit?

Metal objects causing signal reflection and absorption

Insufficient client device RAM

Outdated DHCP server configuration

Disabled MAC address filtering

7. Which metric is most critical when evaluating WLAN performance issues?

Data throughput, latency, and packet loss

Access point model year

Client device operating system

Network administrator expertise

8. What does the term 'roaming' refer to in WLAN context?

Client transitioning between access points while maintaining connectivity

Access point transmitting at maximum power

Client moving away from the WLAN coverage area

Multiple networks sharing the same channel

9. A WLAN site survey reveals dead zones with poor coverage. Which mitigation strategy is most effective?

Deploy additional access points and optimize AP placement

Increase transmit power on existing APs

Disable 5 GHz band operation

Reduce client device count

10. What is the primary advantage of using OFDM modulation in 802.11ac WLANs?

Efficient spectrum usage and resistance to multipath fading

Increased physical range

Reduced power consumption

Automatic channel selection

11. Which of the following is the primary cause of multipath fading in indoor WLAN environments?

Radio waves reflecting off walls, metal objects, and furniture

Excessive client device density

Inadequate power supply to access points

Incorrect SSID broadcast settings

12. A client cannot authenticate to a WPA2-PSK network despite entering the correct passphrase. What should be checked first?

Access point time synchronization and PSK configuration

Client device's Bluetooth settings

Router's WAN connection status

Client device's display brightness

13. What does the term 'hidden node problem' refer to in WLAN environments?

Nodes unable to detect each other but interfering at the AP

Access points broadcasting in stealth mode

Clients using VPN encryption

Access points placed behind physical barriers

14. Which frequency band offers the widest available channels for WLAN operation?

5 GHz (802.11ac and 802.11ax)

2.4 GHz (802.11b/g/n)

6 GHz (802.11ax)

900 MHz (legacy 802.11)

15. A WLAN experiences throughput degradation during peak hours. What is the most likely cause?

Excessive client density and channel congestion

Incorrect access point mounting height

Disabled broadcast of SSID

Incompatible router firmware

16. Which of the following tools is most useful for identifying rogue access points on a WLAN?

WiFi analyzer or packet sniffer

Network printer

VPN client

DHCP server

17. What is the typical SNR (Signal-to-Noise Ratio) threshold required for reliable 802.11ac data transmission?

At least 25 dB

At least 5 dB

At least 50 dB

At least 10 dB

18. A client device repeatedly disconnects from the WLAN after a few minutes. Which troubleshooting step should be performed first?

Check signal strength and look for interference sources

Immediately replace the access point

Disable WPA2 security

Reset the client device to factory settings

19. Which channel set should you use to minimize co-channel interference in a 2.4 GHz WLAN?

Channels 1, 6, and 11

Channels 2, 7, and 12

Channels 3, 8, and 13

Channels 1, 2, and 3

20. What does RSSI measure in WLAN diagnostics?

The strength of the received wireless signal

The speed of data transmission

The number of retransmitted frames

The encryption key strength