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CWNP CWAP-405 Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: WLAN Medium Access	10%	- Medium access performance analysis - Contention and coordination functions - CSMA/CA and medium access rules - Medium access related issues
Topic 2: MAC Sublayer and Functions	25%	- QoS and power management - MAC frame formats and types - MAC addressing and operations - MAC layer troubleshooting
Topic 3: Spectrum Analysis	10%	- RF spectrum fundamentals - Troubleshooting RF issues - Interference detection and classification - Spectrum analysis tools
Topic 4: Protocol Analysis	15%	- Protocol analysis fundamentals - Troubleshooting using protocol data - Analysis tools and methods - Capture and decode process
Topic 5: PHY Layers and Technologies	10%	- PHY layer troubleshooting - Modulation and coding schemes - Channelization and frequency usage - 802.11 physical layer standards
Topic 6: 802.11 Frame Exchanges	30%	- Frame exchange sequences - Data transfer and protection mechanisms - Association and authentication processes - Frame exchange troubleshooting

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CWNP Certified Wireless Analysis Professional Sample Questions (Q133-Q138):

NEW QUESTION # 133
You need to determine RF activity over time in a spectrum analyzer. It is to be able to see the activity and the amplitude of that activity.
What kind of view should be used?

A. Swept spectrogram
B. Channel listing
C. Device listing
D. Real-time FFT

Answer: A

Explanation:
The FFT shows spectral activity in the frequency domain, while waterfall or swept spectrogram views attempt to represent RF activity over time

NEW QUESTION # 134
Prior to a retransmission what happens to the CWmax value?

A. Set to the value of the AIFSN
B. Increases by 1
C. Doubles and increases by 1
D. Reset to 0

Answer: C

Explanation:
Before a retransmission, the CWmax (Contention Window maximum) value doubles and increases by 1. The CWmax is a parameter that determines the upper limit of the random backoff time that a STA (station) has to wait before attempting to access the medium. The random backoff time is chosen from a range of values between CWmin (Contention Window minimum) and CWmax. The CWmin and CWmax values depend on the AC (Access Category) of the traffic and the PHY type of the STA. If a transmission fails due to a collision or an error, the STA has to retransmit the frame after waiting for another random backoff time. However, to reduce the probability of another collision, the STA increases its CWmax value by doubling it and adding 1.
This increases the range of possible backoff values and spreads out the STAs more evenly. The STA resets its CWmax value to its original value after a successful transmission or after reaching a predefined limit. References: [Wireless Analysis Professional Study Guide CWAP-405], Chapter 7: QoS Analysis, page
196-197

NEW QUESTION # 135
Using a portable analyzer you perform a packet capture next to a client STA and you can see that the STA is associated to a BSS. You observe the STA sending packets to the AP and the AP sending packets to the STA.
Less than 2% of all packets are retransmissions. You move to capture packets by the AP and, while the retry rate is still less than 2%, you now only see unidirectional traffic from the AP to the client. How do you explain this behavior?

A. The portable analyzer is too close to the AP causing CCI, blinding the AP to the clients packets
B. The STA is transmitting data using more spatial streams than the potable analyzer can support
C. There is a transmit power mismatch between the client and the AP and while the client can hear the APs traffic, the AP cannot hear the client
D. The portable analyzer has a lower receive sensitivity than the AP and while it can't capture the packets from the client STA, the AP can receive them OK

Answer: D

Explanation:
Receive sensitivity is the minimum signal level that a receiver can detect and decode. Different devices may have different receive sensitivity levels depending on their hardware specifications and antenna configurations. In this scenario, the portable analyzer has a lower receive sensitivity than the AP, meaning that it requires a stronger signal to capture the packets from the client STA. The AP, on the other hand, has a higher receive sensitivity and can receive the packets from the client STA even if they have a weaker signal. This explains why the portable analyzer can only see unidirectional traffic from the AP to the client when capturing near the AP5 References:
* CWAP-403 Study Guide, Chapter 4: PHY Layer Analysis, page 121
* CWAP-403 Objectives, Section 4.3: Analyze PHY layer metrics

NEW QUESTION # 136
Which one of the following portions of information is communicated by bits in the PHY Header?

A. SNR
B. Data rate
C. Signal strength
D. Noise

Answer: B

Explanation:
One of the information that is communicated by bits in the PHY header is data rate. Data rate is the speed at which data is transmitted or received over the wireless medium. Data rate depends on factors such as modulation, coding, channel width, spatial streams, and guard interval. Data rate is indicated by bits in different fields of the PHY header, depending on the type of PPDU (e.g., OFDM, HT, VHT, HE). The receiver uses these bits to determine how to decode and demodulate the rest of the PPDU. The other options are not correct, as they are not communicated by bits in the PHY header. SNR (Signal-to-Noise Ratio), noise, and signal strength are measured by the receiver based on its own capabilities and environment. References: [Wireless Analysis Professional Study Guide CWAP-405], Chapter 4: 802.11 Physical Layer, page 101-105

NEW QUESTION # 137
Which information elements (IE) are contained in an IEEE 802.11 Probe Request frame?
(Choose 2)

A. SSID
B. RSN IE
C. Status code
D. Association ID
E. Supported rates

Answer: A,E

NEW QUESTION # 138
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