CWNP Certified Wireless Analysis Professional Sample Questions:

1. You are troubleshooting an intermittent problem with some WLAN VoIP phones resulting in dropped calls. You configure your capture on a fixed channel matching the current operating channel of a test phone. So far, you have been unsuccessful in capturing the problem because the VoIP phone always roams to another AP before the problem occurs. What would be the best setup for your packet capture to make sure you capture the problem?

A) Configure the capture adaptor to scan all channels used in the environment.
B) Configure all APs in monitor mode and have the packets streamed back to your analyzer.
C) Use multiple capture adaptors and the channel aggregator feature of a protocol analyzer to capture on all AP channels in the client's area.
D) Determine which channel the phone is likely to roam to next and capture on that channel.

2. What is the function of the PHY layer?

A) Convert PPDUs to PSDUs for transmissions and PSDUs to PPDUs for receptions
B) Convert MSDUs to PPDUs for transmissions and PPDUs to MSDUs for receptions
C) Convert PPDUs to MSDUs for transmissions and MSDUs to PPDUs for receptions
D) Convert PSDUs to PPDUs for transmissions and PPDUs to PSDUs for receptions

3. You have been engaged by ABC corporation to troubleshoot a WLAN problem. Users have been reporting random disconnections. You perform Spectrum Analysis as part of your troubleshooting process and notice a frequency hopping signal across the entire 2.4 GHz band. The signal amplitude is -65 dBm and has a duty cycle of 5%. What do you conclude about this frequency hopping signal?

A) The low duty cycle means this signal is very unlikely to be the cause of the disconnections.
B) Interference from frequency hopping signals always results in client disconnections.
C) Only clients with a lower signal strength will be disconnected.
D) The high amplitude of this signal is overpowering the Wi-Fi clients resulting in the disconnections.

4. You have deployed a new 802.11ac WLAN for a customer who wants to take advantage of
802.11ac standardized Transmit Beamforming. After the installation you perform a protocol capture to confirm Transmit Beamforming is operating as expected. When analyzing the protocol exchange you observe the beamformer transmits a VHT NDP Announcement frame but you never see the transmitted NDP. What do you conclude from this behavior?

A) This is normal, 802.11ac includes the NDP within the VHT NDP Announcement.
B) NDPs are PHY PPDUs which contain no MPDU and therefore will not be displayed in a protocol analyzer.
C) This indicates the beamformer is misconfigured.
D) This behavior is non-standard and is likely a bug with the current driver.

5. During a successful FT over-the-DS roam, which 802.11 frames are transmitted between the client and the new AP?

A) 2 Authentication Frames, Reassociation Request and Reassociation Response
B) 2 Authentication Frames, Reassociation Request, Reassociation Response, 802.1X/EAP exchange and 4-Way handshake
C) 2 Authentication Frames, Reassociation Request, Reassociation Response and 4-Way Handshake
D) Reassociation Request and Reassociation Response

Solutions: