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CWNP Certified Wireless Analysis Professional Sample Questions (Q82-Q87):

NEW QUESTION # 82
The data rate for a data frame is 150 Mbps in 5 GHz.
What rate is used to transmit the PHY header information?

A. 150 Mbps
B. 1 Mbps
C. 75 Mbps
D. 6 Mbps

Answer: B

Explanation:
References:

NEW QUESTION # 83
Several users have reported WLAN network connection issues and the users connect to the same AP. These users are spread throughout a 320 square meter area. Using a spectrum analyzer, you see RF energy across the entire 2.4 GHz band at significant signal strength levels. The users all connect using either HT or ERP devices.
What is the likely cause of this problem within this area?

A. Bluetooth devices
B. Video camera
C. Wide-band jammer
D. Microwave oven

Answer: C

NEW QUESTION # 84
To what data rates can a 5 GHz PHY device shift when changers occur in the signal strength?

A. 24, 18, 12, 6
B. 11, 5.5, 2, 1
C. 24, 18, 12, 5.5
D. 24, 18, 11, 2

Answer: A

NEW QUESTION # 85
What interframe space would be expected between a CIS and a Data frame?

A. SIFS
B. DIFS
C. AIFS
D. PIFS

Answer: A

Explanation:
The interframe space that would be expected between a CTS (Clear to Send) and a Data frame is SIFS (Short Interframe Space). A SIFS is the shortest interframe space that is used for high-priority transmissions, such as ACKs (Acknowledgements), CTSs, or data frames that are part of a fragmentation or aggregation process. A SIFS is a fixed value that depends on the PHY type and channel width. A CTS and a Data frame are part of a virtual carrier sense mechanism called RTS/CTS (Request to Send/Clear to Send), which is used to avoid collisions and hidden node problems in wireless transmissions. When a STA (station) wants to send a data frame, it first sends an RTS frame to the intended receiver, indicating the duration of the transmission. The receiver then responds with a CTS frame, also indicating the duration of the transmission. The other STAs in the vicinity hear either the RTS or the CTS frame and update their NAV (Network Allocation Vector) timers accordingly, deferring their access to the medium until the transmission is over. The sender then sends the data frame after waiting for a SIFS, followed by an ACK frame from the receiver after another SIFS. The other options are not correct, as they are not used between a CTS and a Data frame. A PIFS (PCF Interframe Space) is used for medium access by the PCF (Point Coordination Function), which is an optional and rarely implemented polling-based mechanism that provides contention-free service for time-sensitive traffic. An AIFS (Arbitration Interframe Space) is used for medium access by different ACs (Access Categories), which are logical queues that correspond to different QoS (Quality of Service) levels for different types of traffic. An AIFS is a variable interframe space that depends on the AIFSN (Arbitration Interframe Space Number) value of each AC. A DIFS (Distributed Interframe Space) is used for medium access by the DCF (Distributed Coordination Function), which is the default and mandatory contention-based mechanism that provides best- effort service for normal traffic. References: [Wireless Analysis Professional Study Guide CWAP-405], Chapter 6: 802.11 Frame Exchanges, page 166-167; Chapter 7: QoS Analysis, page 194-195

NEW QUESTION # 86
You are analyzing a packet decode of a Probe Request and notice the SSID element has a length of zero.
What do you conclude about the transmitting STA?

A. The STA is operating in Ad-Hoc mode
B. The STA's WLAN adaptor is disabled
C. The STA is discovering a list of available BSSs
D. The WLAN adaptor is configured in promiscuous mode

Answer: C

Explanation:
The STA is discovering a list of available BSSs by sending a Probe Request with an empty SSID element.
This is also known as a broadcast Probe Request, as it does not specify any particular SSID to probe for. Any AP that receives this Probe Request will respond with a Probe Response containing its own SSID and other information about its BSS. This way, the STA can learn about all the BSSs in its vicinity and choose which one to associate with . References: CWAP-405Certified Wireless Analysis Professional Study and Reference Guide, Chapter 6: MAC Sublayer Frame Exchanges, page 191; CWAP-405Certified Wireless Analysis Professional Study and Reference Guide, Chapter 6: MAC Sublayer Frame Exchanges, page 193.

NEW QUESTION # 87
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