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| Section | Objectives |
|---|---|
| WLAN Protocol Analysis | - MAC Layer Operations and Behaviors - Frame Types and Exchanges (Management, Control, Data) - 802.11 Frame Structure and Fields |
| Wireless Troubleshooting and Performance Analysis | - Identifying WLAN Performance Issues - Throughput and Latency Analysis - Common WLAN Failure Scenarios |
| RF and PHY Layer Analysis | - 802.11 PHY Standards Overview - RF Propagation and Signal Behavior - Channelization and Spectrum Usage |
| Spectrum Analysis and Tools | - Wireshark and Packet Capture Analysis - Interference Identification (Wi-Fi and Non-Wi-Fi) - Spectrum Analyzer Usage |
>> Reliable CWAP-405 Exam Question <<
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NEW QUESTION # 86
Which one of the following is not an 802.11 Management frame?
Answer: A
Explanation:
A PS-Poll (Power Save Poll) frame is not an 802.11 management frame. A PS-Poll frame is a type of control frame that is used by a STA in power save mode to request data frames from an AP. A STA in power save mode can conserve battery power by periodically sleeping and waking up. When a STA sleeps, it cannot receive any data frames from the AP, so it informs the AP of its power save status by setting a bit in its MAC header. The AP then buffers any data frames destined for the sleeping STA until it wakes up. When a STA wakes up, it sends a PS-Poll frame to the AP, indicating its association ID and requesting any buffered data frames. The AP then responds with one or more data frames, followed by an ACK or BA frame from the STA. The other options are not correct, as they are types of 802.11 management frames. An Action frame is used to perform various management actions, such as spectrum management, QoS management, radio measurement, etc. A Beacon frame is used to advertise the presence and capabilities of an AP or BSS. An Authentication frame is used to establish or terminate an authentication relationship between a STA and an AP. References: [Wireless Analysis Professional Study Guide CWAP-405], Chapter 6: 802.11 Frame Exchanges, page 169-170
NEW QUESTION # 87
The PHY layer provides framing by adding a header to create what type of data unit?
Answer: B
Explanation:
The PHY layer adds its header and preamble to the PSDU received from the MAC layer, forming a Physical Protocol Data Unit (PPDU). The PPDU is the complete unit transmitted over the RF medium and represents the framed data at the physical layer.
NEW QUESTION # 88
Finish the statement:
It is possible to distinguish between _______ 22 MHz transmissions and ______ 20 MHz transmissions when looking at an FFT plot.
Answer: B
Explanation:
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.
NEW QUESTION # 89
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?
Answer: C
Explanation:
To decrypt WPA2-PSK data frames, the analyzer must capture the complete 4-Way Handshake because it contains the nonces and keying material used to derive the Pairwise Transient Key.
The PSK and SSID alone are insufficient; the handshake exchange is required to compute the encryption keys that protect subsequent data frames.
NEW QUESTION # 90
How is the length of an AIFS calculated?
Answer: A
Explanation:
The Arbitration Interframe Space (AIFS) is calculated as the Short Interframe Space plus a number of slot times determined by the AIFSN value. The formula is SIFS plus AIFSN multiplied by the slot time, which defines the waiting period before a station may begin contention for the medium under EDCA.
NEW QUESTION # 91
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