CWAP-404 PrüfungGuide, CWNP CWAP-404 Zertifikat - Certified Wireless Analysis Professional

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CWNP CWAP-404 Prüfungsplan:

Thema	Einzelheiten
Thema 1	Spectrum Analysis: The topic assesses the ability of a wireless network professional to capture and interpret RF spectrum data. The exam targets the skills in identifying device signatures and RF issues through spectrum analyzers.
Thema 2	WLAN Medium Access: The exam evaluates the understanding of a wireless network professional about 802.11 contention algorithms and their impact on WLAN performance. The CWAP-404 exam requires candidates to analyze QoS configurations and operations.
Thema 3	Protocol Analysis: The topic in the CWNP CWAP-404 exam evaluates the skill of a wireless network professional to capture and analyze 802.11 frames effectively. Candidates must demonstrate proficiency in configuring protocol analysis tools, interpreting frame captures to diagnose issues, and applying appropriate troubleshooting methods.
Thema 4	MAC Sublayer and Functions: The topic measures the ability of a wireless network professional to understand and analyze the MAC layer operations. Candidates are expected to validate BSS configurations and identify issues like CRC errors and retransmissions, ensuring they can maintain the integrity and performance of the WLAN.
Thema 5	PHY Layers and Technologies: In the topic, the CWAP-404 exam tests the understanding of a wireless network professional about the Physical (PHY) layer functions and technologies. Wireless analysts need to describe and apply knowledge of PHY headers, PPDUs, and other PHY-related data. This topic ensures that analysts are proficient in interpreting PHY information within protocol analyzers and can select appropriate capture devices for different PHY types.

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CWNP Certified Wireless Analysis Professional CWAP-404 Prüfungsfragen mit Lösungen (Q55-Q60):

55. Frage
Given: The Frame Check Sequence (FCS) is a 32 CRC used for error detection. The CRC is calculated over what?

A. Mac Header and Frame Body only
B. PHY Header, MAC Header and Frame Body
C. Frame Body only
D. PHY Header and MAC Header only

Antwort: A

Begründung:
The CRC is calculated over the MAC Header and Frame Body only. The CRC (Cyclic Redundancy Check) is a 32-bit value that is used for error detection in wireless transmissions.
The CRC is calculated over the MAC Header and Frame Body of a PSDU, which are the parts of the data unit that contain information such as source and destination addresses, frame type, frame control, sequence number, payload, etc. The CRC is appended to the end of the PSDU as a FCS (Frame Check Sequence) field. The CRC is not calculated over the PHY Header or PHY Preamble, which are parts of the PPDU that contain information such as modulation, coding, data rate, etc. The PHY Header and PHY Preamble are added or removed by the PHY layer during the conversion between PSDU and PPDU.

56. Frage
As it pertains to HT L-SIG TXOP Protection, what statement is true?

A. An L-SIG TXOP protected frame exchange sequence always begins with an RTS/CTS or a CTS- to-Self.
B. Support for L-SIG TXOP Protection is indicated by HT stations in the L-SIG field of the PLCP header of HT-mixed format frames.
C. Support for L-SIG TXOP Protection is indicated in the HT Capabilities Info field of (re)association request frames sent by ERP, OFDM, and HT-OFDM stations.
D. L-SIG TXOP Protection is specified for the purpose of protecting OFDM (802.11a/g) and HT- OFDM (802.11n) transmissions from HR/DSSS stations.

Antwort: A

57. Frage
802.11k Neighbor Requests and Neighbor Reports are sent in what type of Management Frames?

A. Reassociation Request and Reassociation Response
B. Action
C. RRM
D. Beacon

Antwort: B

Begründung:
802.11k Neighbor Requests and Neighbor Reports are sent in Action frames. An Action frame is a Management frame that is used to perform various operations or functions related to the operation or maintenance of a wireless network. An Action frame consists of a Category field that indicates the type of action being performed, and a variable-length Action Details field that contains specific information related to the action. For example, an Action frame with a Category field value of 5 indicates a Radio Measurement action, and the Action Details field may contain a Neighbor Request or a Neighbor Report subelement.

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

A. The Frame Control field is used to communicate the duration value
B. The Frame Control field is always set to 0
C. Only Control frames have a Frame Control field
D. The Frame Control field contains three sub-fields and eight one-bit flags

Antwort: D

Begründung:
Explanation: The Frame Control field in the 802.11 MAC header contains several sub-fields that define control information about the frame, including the type of frame, whether the frame is fragmented, and other parameters. Specifically, the Frame Control field has two main parts:
The sub-fields include Protocol Version, Type, Subtype, etc.
It also contains eight one-bit flags such as To DS, From DS, More Fragments, Retry, Power Management, etc.

59. Frage
Given a protocol analyzer can decrypt WPA2-PSK data packets providing the PSK and SSID are configured in the analyzer software.
When performing packet capture (in a non-FT environment) which frames are required in order for PSK frame decryption to be possible?

A. Probe Response
B. Reassociation
C. Authentication
D. 4-Way Handshake

Antwort: D

Begründung:
The 4-way handshake is the process that establishes the pairwise transient key (PTK) between the client and the AP in WPA2-PSK. The PTK is derived from the PSK, the SSID, and some random numbers exchanged in the handshake frames. The PTK is used to encrypt and decrypt the data frames between the client and the AP. Therefore, in order to decrypt WPA2-PSK data packets, a protocol analyzer needs to capture the 4-way handshake frames and have the PSK and SSID configured in the analyzer software.

60. Frage
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