CWAP-405 Prüfung, CWAP-405 Prüfungsinformationen

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CWNP CWAP-405 Exam Syllabus Topics:

Section	Objectives
Spectrum Analysis and Tools	- Interference Identification (Wi-Fi and Non-Wi-Fi) - Spectrum Analyzer Usage - Wireshark and Packet Capture Analysis
WLAN Protocol Analysis	- 802.11 Frame Structure and Fields - MAC Layer Operations and Behaviors - Frame Types and Exchanges (Management, Control, Data)
RF and PHY Layer Analysis	- 802.11 PHY Standards Overview - Channelization and Spectrum Usage - RF Propagation and Signal Behavior
Wireless Troubleshooting and Performance Analysis	- Identifying WLAN Performance Issues - Common WLAN Failure Scenarios - Throughput and Latency Analysis

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CWAP-405 Prüfungsinformationen - CWAP-405 Musterprüfungsfragen

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CWNP Certified Wireless Analysis Professional CWAP-405 Prüfungsfragen mit Lösungen (Q51-Q56):

51. Frage
IEEE 802.11-2007 specifies two ERP protection mechanisms: RTS/CTS and CTS-to-Self. Which statement is true regarding these two protection mechanisms? (Choose 2)

A. A CTS-to-Self frame sent by a client station may reach fewer nodes than the RTS/CTS frame exchange.
B. By definition, all associated client stations in a BSS can hear RTS, CTS, and CTS-to-Self frames, so RTS/CTS and CTS-to-Self mechanisms have equal effectiveness.
C. Use of RTS/CTS requires more overhead than CTS-to-Self due to a higher number of frames transmitted onto the wireless medium.
D. RTS and CTS frames are relayed through the access point, whereas the CTS-to-Self frames are not.
E. RTS and CTS frames use Short Interframe Spaces (SIFS), and CTS-to-Self frames use PCF Interframe Spaces (PIFS).
F. Aside from the Subtype subfield of the Frame Control field, the generic MAC header format of RTS and CTS frames are identical.

Antwort: A,C

52. Frage
You are exploring the packet decode of an 802.11 data frame and notice the To DS and From DS bits of the Frame Control field are both set to 1. Assuming the frame does not have a CRC error, what can you conclude about this frame?

A. This is non-standard 802.11 behavior and this frame must be part of the proprietary feature.
B. The frame is a retransmission.
C. The frame was transmitted between two WLAN infrastructure devices such as WLAN bridges or Mesh APs.
D. The frame has been transmitted on an Ad-Hoc network.

Antwort: C

Begründung:
When both To DS and From DS bits are set to 1, it indicates a wireless distribution system (WDS) frame. These are used when frames are forwarded between infrastructure devices like APs in a mesh network or wireless bridge, not between clients and APs.

53. Frage
How does a VoIP Phone, using WMM Power Save, request data frames buffered at the AP?

A. The VoIP phone transmits a WMM Action frame
B. The VoIP phone transmits a PS-Poll frame
C. The VoIP phone sets the More Data bit in the MAC Header to 1
D. The VoIP phone transmits a trigger frame, which is a QoS Null frame or a QoS Data frame

Antwort: D

Begründung:
With WMM Power Save (U-APSD), a VoIP phone retrieves buffered frames by sending a trigger frame, which is typically a QoS Null or QoS Data frame. This uplink QoS frame signals the AP to release buffered downlink frames for the corresponding access category, enabling efficient delivery of voice traffic while conserving power.

54. Frage
A manufacturing facility has installed a new automation system which incorporates an 802.11 wireless network. The automation system is controlled from tablet computers connected via the WLAN. However, the automation system has not gone live due to problem with the tablets connecting to the WLAN. The WLAN vendor has been onsite to perform a survey and confirmed good primary and secondary coverage across the facility. As a CWAP you are called in to perform Spectrum Analysis to identify any interference sources.
From the spectrum analysis, you did not identify any interference sources but were able to correctly identify the issue. Which of the following issues did you identify from the spectrum analysis?

A. A high noise floor has resulted in a SNR of less than 20dB
B. There is a power mismatch between the APs and the clients
C. The tablets are connecting to the wrong SSID
D. The tablets are entering power save mode and failing to wake up to receive the access points transmissions

Antwort: B

Begründung:
The most likely issue that can be identified from the spectrum analysis is a power mismatch between the APs and the clients. A power mismatch occurs when the APs transmit at a higher power level than the clients, or vice versa. This can cause asymmetric communication, where one side can hear the other, but not vice versa.
This can result in poor performance, disconnections, or packet loss. A spectrum analysis can reveal a power mismatch by showing different signal amplitudes or RSSI values for the APs and the clients on the same channel or frequency. The other options are not correct, as they cannot be identified from the spectrum analysis alone. The tablets' SSID, power save mode, and noise floor can be determined by using other tools or methods, such as protocol analysis, site survey, or device configuration. References: [Wireless Analysis Professional Study Guide CWAP-405], Chapter 3: Spectrum Analysis, page 79-80

55. Frage
Which one of the statements regarding the Frame Control field in an 802.11 MAC header is true?

A. Only Control frames have a Frame Control field
B. The Frame Control field contains subfields, and soma in 1-bit flags
C. The Frame Control field is used to communicate the duration value
D. The Frame Control field is always set to 0

Antwort: B

Begründung:
The statement that the Frame Control field contains subfields, and some 1-bit flags is true. The Frame Control field is a 2-byte field in the MAC header that contains information about the type, subtype, and characteristics of a frame. The Frame Control field is divided into several subfields, each with a specific function and length.
Some of these subfields are 1-bit flags, which can be set to 0 or 1 to indicate a certain condition or status. For example, the To DS and From DS subfields are 1-bit flags that indicate whether a frame is destined for or originated from the DS (Distribution System). The other statements are not true, as they do not describe the Frame Control field correctly. All types of frames (management, control, and data) have a Frame Control field, not just control frames. The Frame Control field is not used to communicate the duration value, which is a separate field in the MAC header. The Frame Control field is not always set to 0, as it varies depending on the type, subtype, and characteristics of each frame. References: [Wireless Analysis Professional Study Guide CWAP-405], Chapter 5: 802.11 MAC Sublayer, page 113-114

56. Frage
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