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NEW QUESTION # 48
You suspect an interfere may exist in a BSS that is experiencing sporadic problems. You want to identify and locate the device. The actual device identify is not known.
What tool should be used for this purpose?
- A. Throughput tester
- B. Spectrum analyzer
- C. Cable tester
- D. Protocol analyzer
Answer: B
NEW QUESTION # 49
Which one of the following is an advantage of using display filters that is not an advantage of capture-time filters?
- A. Multiple of them can be applied simultaneously
- B. Once created they are reusable for later captures
- C. They only hide the packets from view and the filtered packets can be enabled for view later
- D. They allow for focused analysis on just the packets of interest
Answer: C
Explanation:
Display filters are applied after the capture is completed and they only hide the packets from view. The filtered packets are still present in the capture file and can be enabled for view later by changing or removing the display filter. This is an advantage over capture-time filters, which discard the packets that do not match the filter criteria and cannot be recovered later34 References:
* CWAP-403 Study Guide, Chapter 2: Protocol Analysis, page 37
* CWAP-403 Objectives, Section 2.3: Apply display filters
NEW QUESTION # 50
When configuring a long-term, forensic packet capture and saving all packets to disk which of the following is not a consideration?
- A. Total capture storage space
- B. Analyzer location
- C. Real-time packet decodes
- D. Individual trace file size
Answer: C
Explanation:
Real-time packet decodes are not a consideration when configuring a long-term, forensic packet capture and saving all packets to disk. Real-time packet decodes are useful for live analysis and troubleshooting, but they consume CPU and memory resources that could affect the performance of the capture process. For a long- term, forensic packet capture, it is more important to consider the analyzer location, the total capture storage space, and the individual trace file size. These factors affect the quality and quantity of the captured packets and the ease of post-capture analysis34 References:
* CWAP-405Study Guide, Chapter 2: Protocol Analysis, page 49
* CWAP-405Objectives, Section 2.1: Configure protocol analyzers
NEW QUESTION # 51
How many frames make up the Group Key Handshake excluding any Ack frames that may be required?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: B
Explanation:
The Group Key Handshake consists of two frames excluding any Ack frames that may be required. The Group Key Handshake is used to distribute and update the Group Temporal Key (GTK) for encrypting broadcast and multicast traffic. The AP initiates the Group Key Handshake by sending a Group Key Message
1 frame to a STA, which contains the new GTK and other information. The STA responds with a Group Key Message 2 frame to the AP, which confirms the receipt of the GTK and other information. After this, both the AP and the STA can use the new GTK for encryption and decryption of broadcast and multicast traffic .
References: CWAP-405Certified Wireless Analysis Professional Study and Reference Guide, Chapter 7:
802.11 Security, page 246; CWAP-405Certified Wireless Analysis Professional Study and Reference Guide, Chapter 7: 802.11 Security, page 247.
NEW QUESTION # 52
You are explaining capacity planning to another engineer assisting you on a WLAN implementation project.
As part of the explanation, you provide the following formula: C = B * log2(1 + S/N).
What does this formula define?
- A. Maximum signal strength of a channel
- B. Minimum signal strength for a data rate
- C. The WEP encryption algorithm
- D. Bandwidth capabilities of a channel
Answer: D
NEW QUESTION # 53
Given: Adjacent Channel Interference (ACI) can cause frame corruption and poor performance in WLANs.
You are using a protocol analyzer in the attempt to detect ACI.
What should you look for in such a scenario?
- A. Look at Retry counts
- B. Look for frames with a low signal strength value in the radio tap header
- C. Look at CRC errors
- D. Capture on the channel you think may be impacted by ACI and see if any frames are captured from adjacent channels
Answer: D
NEW QUESTION # 54
The To DS bit is set to 0 and the From DS is set to 1.
What best describes this 802.11 frame?
- A. A frame being transmitted from an AP to a client STA
- B. A frame being transmitted from a client STA to an AP
- C. A frame being transmitted directly from one client STA to another
- D. A frame being transmitted in a mesh BSS
Answer: A
NEW QUESTION # 55
VoIP is used heavily in your organization. You must troubleshoot problems with dropped calls on the WLAN.
What is a common cause of dropped calls when using Wi-Fi VoIP phones?
- A. Data rates below 54 Mbps
- B. Slow roaming
- C. Use of WMM
- D. Data rates below 75 Mbps
Answer: B
NEW QUESTION # 56
Given: Protocol analyzer often have useful graphical dashboards providing information about the health and operations of the WLAN.
What is a valid use of a graph showing the Top APs Based on Active Associations?
- A. Evaluating the capacity handling on a specific channel
- B. Locating overloaded APs
- C. Ensuring compliance with corporate security policies
- D. Discovering the total number of client STAs on your network
Answer: B
NEW QUESTION # 57
You require 802.11ac capture solution. You want to capture using native operating system tools if possible.
What operating system has built-in ability to capture 802.11ac frames assuming it is running on the appropriate laptop hardware?
- A. Windows 7
- B. Windows 10
- C. Mac OS X
- D. Windows 8.1
Answer: C
Explanation:
References:
NEW QUESTION # 58
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 STA is transmitting data using more spatial streams than the potable analyzer can support
- B. 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
- C. The portable analyzer is too close to the AP causing CCI, blinding the AP to the clients packets
- 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 # 59
To what data rates can a 5 GHz PHY device shift when changers occur in the signal strength?
- A. 24, 18, 12, 5.5
- B. 24, 18, 11, 2
- C. 11, 5.5, 2, 1
- D. 24, 18, 12, 6
Answer: D
NEW QUESTION # 60
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. Device listing
- C. Real-time FFT
- D. Channel listing
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 # 61
In a Spectrum Analyzer the Swept Spectrogram plot displays what information?
- A. Wi-Fi Device information
- B. RF power present at a particular frequency over the course of time
- C. The RF time domain
- D. Reductions in frame transmissions
Answer: B
Explanation:
The Swept Spectrogram plot is a spectrum analysis plot that shows the RF power present at a particular frequency over the course of time. It can help identify trends and patterns in the RF spectrum over a longer period of time. It can also show how the RF environment changes over time and how different sources of RF signals affect each other. The other options are not correct, as they describe different types of plots or information that are not related to the Swept Spectrogram plot. References: [Wireless Analysis Professional Study Guide], Chapter 3: Spectrum Analysis, page 72-73
NEW QUESTION # 62
When performing protocol analysis, you notice a high number of RTS/CTS frames being transmitted on an HT network. You suspect this may be due to HT protection mechanisms. Where in the Beacon frame would you look to determine which one of the four HT protection modes the AP is operating in?
- A. HT Information Element
- B. HT Protection Element
- C. HT Operation Element
- D. Non-HT Present Element
Answer: A
Explanation:
When performing protocol analysis, you would look at the HT Information Element in the Beacon frame to determine which one of the four HT protection modes the AP is operating in. The HT Information Element contains various subfields that provide information about the HT network configuration and operation. One of these subfields is the HT Protection field, which indicates whether any protection mechanisms are required for mixed-mode operation with non-HT STAs. The four possible values for this field are:
* No Protection: No protection mechanisms are required.
* Non-member Protection: RTS/CTS or CTS-to-self protection is required for all HT transmissions.
* 20 MHz Protection: RTS/CTS or CTS-to-self protection is required for all HT transmissions using a 40 MHz channel.
* Non-HT Mixed Mode: All HT transmissions must use a non-HT preamble and header . References:
CWAP-405Certified Wireless Analysis Professional Study and Reference Guide, Chapter 11: 802.11n
/ac/ax PHYsical Layer Frame Exchanges, page 378; CWAP-405Certified Wireless Analysis Professional Study and Reference Guide, Chapter 11: 802.11n/ac/ax PHYsical Layer Frame Exchanges, page 379.
NEW QUESTION # 63
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