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CWNP CWAP-405 Exam Syllabus Topics:

Section	Weight	Objectives
Spectrum Analysis Tools and Methodologies	15%	- Spectrum analyzer configuration parameters and visualization layouts 1. Configure sweeping rules, RBW controls, and span baselines 2. Interpret real-time FFT graphs, waterfall logs, and persistence charts - Non-802.11 interference isolation and signature tracking 1. Analyze duty cycle measurements to evaluate active airtime constraints 2. Identify signatures of Bluetooth, microwave ovens, and analog video systems
Protocol Analysis Tools and Methodologies	15%	- WLAN analyzer architectures and placement configurations 1. Configure local and remote frame capture adapters 2. Implement multi-channel packet aggregators 3. Analyze hardware timestamp methods to minimize processing delays - Troubleshooting methodologies and capture safety 1. Isolate protocol analyzer drop counts during heavy file transfers 2. Apply disciplined network diagnostic isolation lifecycles
802.11 Operation and Frame Exchanges	40%	- Control plane handshakes and transmission recovery operations 1. Evaluate Block ACK session initialization and bitmap tracking loops 2. Analyze RTS/CTS protection rules and standard ACK frame transmissions - Management sublayer protocols and connectivity lifecycles 1. Analyze beaconing, multi-BSSID profiles, and probe exchange sequences 2. Trace authentication, association, and multi-tier roaming handshakes 3. Evaluate 802.11 power save operational states and timeline markers - Security framework verification and encryption tracking 1. Deconstruct WPA3, SAE, and 4-way handshake key exchanges 2. Trace 802.1X/EAP authentication phase transitions
802.11 Frame Formats and Technologies	20%	- MAC sublayer encapsulation and frame structural components 1. Evaluate A-MPDU and A-MSDU frame aggregation structures 2. Deconstruct MAC header fields, duration IDs, and sequence controls - Physical Layer (PHY) header mechanics and encoding structures 1. Analyze PHY metrics including HE, EHT, and VHT configuration nodes 2. Decode training fields, signal fields, and preamble formats
WLAN Medium Access	10%	- Contention algorithms and wireless scheduling parameters 1. Analyze DCF mechanics, carrier sensing, and backoff timers 2. Evaluate EDCA parameters, access categories, and TXOP duration limits

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CWNP Certified Wireless Analysis Professional CWAP-405 Prüfungsfragen mit Lösungen (Q139-Q144):

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

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

Antwort: A

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

140. Frage
An RTS frame should be acknowledged by which frame?

A. Ack
B. Block Ack
C. RTS-Ack
D. CTS

Antwort: D

Begründung:
An RTS (Request to Send) frame should be acknowledged by a CTS (Clear to Send) frame. An RTS and CTS frame are types of control frames that are used to implement a virtual carrier sense mechanism called RTS
/CTS. RTS/CTS is a technique that helps to avoid collisions and hidden node problems in wireless transmissions. When a STA (station) wants to send a data frame, it first sends an RTS frame to the intended receiver, indicating the duration of the transmission. The receiver then responds with a CTS frame, also indicating the duration of the transmission. The other STAs in the vicinity hear either the RTS or the CTS frame and update their NAV (Network Allocation Vector) timers accordingly, deferring their access to the medium until the transmission is over. The sender then sends the data frame, followed by an ACK (Acknowledgement) frame from the receiver. The other options are not correct, as they are not used to acknowledge an RTS frame. An ACK frame is used to acknowledge a data frame, not an RTS frame. An RTS- Ack frame does not exist, as there is no such type of control frame in 802.11. A Block Ack (BA) frame is used to acknowledge multiple data frames in a single frame, not an RTS frame. References: [Wireless Analysis Professional Study Guide CWAP-405], Chapter 6: 802.11 Frame Exchanges, page 166-167

141. Frage
Which statement accurately describes IEEE 802.11 Power Save operation in a Basic Service Set that does not support the QoS facility?

A. Following a period of time in a low power state, client stations wake themselves and automatically poll the access point for traffic using a PS-Poll frame.
B. When the access point's buffer is full, the access point wakes all client stations using a PS-Poll frame so that they can receive the data.
C. After waking from a low power state, client stations listen for the next Beacon to determine if sending a PS-Poll frame to the access point is necessary.
D. After waking at a scheduled TBTT, client stations send Null Function frames to the access point with the Power Management bit set back to zero.
E. Upon receiving traffic for a dozing station, the access point wakes the client station using a PS- Poll frame so that the client station can receive the data.

Antwort: C

142. Frage
After performing a protocol analysis capture on channel 36 you are looking at the radio tap header of a data frame and notice the frame was transmitted at MCS 0 on one spatial stream. At what data rate was the PHY Header for this frame transmitted?

A. 1 Mbps
B. 6.5 Mbps
C. 2 Mbps
D. 6 Mbps

Antwort: D

Begründung:
On channel 36 (5 GHz band), the PHY header is always transmitted using one of the basic OFDM rates to ensure all devices can decode it. For 802.11a/n/ac in 5 GHz, the PHY header is sent at 6 Mbps, regardless of the MCS rate used for the data portion of the frame.

143. Frage
Finish the statement:
It is possible to distinguish between _______ 22 MHz transmissions and ______ 20 MHz transmissions when looking at an FFT plot.

A. ERP and VHT
B. HR/DSSS and ERP
C. HT and VHT
D. OFDM and HT

Antwort: B

Begründung:
HR/DSSS transmissions (such as 802.11b) occupy approximately 22 MHz of spectrum, while ERP (802.11g) OFDM transmissions occupy 20 MHz. On an FFT plot, this difference in occupied bandwidth allows you to visually distinguish the wider 22 MHz DSSS signal from the narrower 20 MHz OFDM signal.

144. Frage
......

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