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CWNP CWAP-405 Exam Syllabus Topics:

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

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CWNP Certified Wireless Analysis Professional CWAP-405 Prüfungsfragen mit Lösungen (Q76-Q81):

76. 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 valued
B. The Frame Control field is always set to 0
C. The Frame Control field contains subfields, and some are 1-bit flags
D. Only Control frames have a Frame Control field

Antwort: C

Begründung:
The Frame Control field in the 802.11 MAC header is composed of multiple subfields, including several 1-bit flags such as To DS, From DS, More Fragments, Retry, Power Management, More Data, Protected Frame, and Order. These subfields define the type, subtype, and control characteristics of the frame.

77. Frage
In the 2.4 GHZ band, what data rate are Probe Requests usually sent at from an unassociated STA?

A. MCS 0
B. 6 Mbps
C. 1 Mbps
D. The minimum basic rate

Antwort: D

Begründung:
In the 2.4 GHz band, probe requests are usually sent at the minimum basic rate from an unassociated STA. A probe request is a type of management frame that is transmitted by a STA to discover available BSSs in its vicinity. A probe request can be sent on one or more channels in either passive or active scanning mode. In passive scanning mode, a STA listens for beacon frames from APs on each channel. In active scanning mode, a STA sends probe requests on each channel and waits for probe responses from APs. A probe request is usually sent at the minimum basic rate, which is the lowest data rate among the supported rates that is required for all STAs to join and communicate with a BSS. The minimum basic rate can vary depending on the configuration of each BSS, but it is typically one of these values: 1 Mbps, 2 Mbps, 5.5 Mbps, or 11 Mbps in the 2.4 GHz band. The other options are not correct, as they do not reflect how probe requests are usually sent in the 2.4 GHz band. MCS 0 is a modulation and coding scheme used by 802.11n/ac devices in either band, but it is not a data rate per se. 6 Mbps is a data rate used by OFDM devices in either band, but it is not usually configured as a minimum basic rate in the 2.4 GHz band. References: [Wireless Analysis Professional Study Guide CWAP-405], Chapter 5: 802.11 MAC Sublayer, page 123-124

78. Frage
When performing protocol analysis, you capture an 802.11ac data frame on channel 52, transmitted at MCS 8. At what data rate was the PHY Preamble transmitted?

A. 86.7 Mbps
B. 54 Mbps
C. 6 Mbps
D. 78 Mbps

Antwort: C

Begründung:
In 802.11ac (VHT), the initial legacy portion of the preamble is transmitted using the legacy OFDM format so that all nearby receivers can detect and synchronize to the transmission and decode the signaling needed to interpret the rest of the PPDU. In 5 GHz, this legacy preamble portion is sent at the lowest mandatory OFDM rate, which is 6 Mbps, regardless of the data frame's MCS.

79. Frage
An HT STA does not receive an ACK for a first-attempt data frame that it transmitted. Assuming this STA is not using BlockAcks in this case, what happens to the HT STA's EDCA contention window?

A. The contention window is not affected by failed Data frame delivery.
B. It varies because the backoff algorithm is random.
C. The contention window is immediately closed, and the frame is retransmitted.
D. The contention window approximately doubles in size.
E. The slot time within the contention window decreases by 50%.

Antwort: D

80. Frage
When would you expect to see a Reassociation Request frame'

A. Only when a STA is using FT roaming
B. Only when a STA roams back to an AP it has previously been associated with
C. Every time a STA associates to an AP to which it has previously been associated
D. Every time a STA roams

Antwort: D

Begründung:
A Reassociation Request frame is sent every time a STA roams from one AP to another within the same ESS.
A Reassociation Request frame is similar to an Association Request frame, but it also contains the BSSID of the current AP that the STA is leaving. This allows the new AP to coordinate with the old AP and transfer the STA's context information, such as security keys, QoS parameters, and buffered frames. This way, the STA can maintain its connectivity and session continuity during roaming . References: CWAP-405Certified Wireless Analysis Professional Study and Reference Guide, Chapter 6: MAC Sublayer Frame Exchanges, page 195; CWAP-405Certified Wireless Analysis Professional Study and Reference Guide, Chapter 6: MAC Sublayer Frame Exchanges, page 196.

81. Frage
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