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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: WLAN Medium Access | 10% | - Contention algorithms and wireless scheduling parameters
|
| Topic 2: Protocol Analysis Tools and Methodologies | 15% | - WLAN analyzer architectures and placement configurations
|
| Topic 3: 802.11 Operation and Frame Exchanges | 40% | - Control plane handshakes and transmission recovery operations
|
| Topic 4: 802.11 Frame Formats and Technologies | 20% | - Physical Layer (PHY) header mechanics and encoding structures
|
| Topic 5: Spectrum Analysis Tools and Methodologies | 15% | - Non-802.11 interference isolation and signature tracking
|
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NEW QUESTION # 101
The PHY layer provides framing by adding a header to create what type of data unit?
Answer: C
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 # 102
You are analyzing a packet decode of a Probe Request and notice the SSID element has a length of zero.
What do you conclude about the transmitting STA?
Answer: D
Explanation:
The STA is discovering a list of available BSSs by sending a Probe Request with an empty SSID element.
This is also known as a broadcast Probe Request, as it does not specify any particular SSID to probe for. Any AP that receives this Probe Request will respond with a Probe Response containing its own SSID and other information about its BSS. This way, the STA can learn about all the BSSs in its vicinity and choose which one to associate with . References: CWAP-405Certified Wireless Analysis Professional Study and Reference Guide, Chapter 6: MAC Sublayer Frame Exchanges, page 191; CWAP-405Certified Wireless Analysis Professional Study and Reference Guide, Chapter 6: MAC Sublayer Frame Exchanges, page 193.
NEW QUESTION # 103
You are troubleshooting a client that is experiencing slow WLAN performance. As part of the troubleshooting activity, you start a packet capture on your laptop close to the client device. While analyzing the packets, you suspect that you have not captured all packets transmitted by the client. By analyzing the trace file, how can you confirm if you have missing packets?
Answer: B
Explanation:
One way to confirm if you have missing packets in your packet capture is to look for gaps in the sequence number in MAC headers. The sequence number is a 12-bit field in the MAC header that is used to identify and order data frames within a traffic stream. The sequence number is incremented by one for each new data frame transmitted by a STA, except for retransmissions, fragments, and control frames. The sequence number can range from 0 to 4095, and then wraps around to 0. If you see a jump or a gap in the sequence number between two consecutive data frames from the same STA, it means that you have missed some packets in between. The other options are not correct, as they do not confirm if you have missing packets in your packet capture. CRC errored packets are packets that have been corrupted during transmission and have failed the error detection check. Protocol analyzers may show the number of CRC errored packets in their statistics view, but not the number of missing packets. Retransmissions are an indication of packet loss or collision, but not necessarily of missing packets in your capture. References: [Wireless Analysis Professional Study Guide CWAP-405], Chapter 5: 802.11 MAC Sublayer, page 114-115
NEW QUESTION # 104
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: D
Explanation:
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 software12 References:
* CWAP-405Study Guide, Chapter 3: 802.11 MAC Layer Frame Formats and Technologies, page 87
* CWAP-405Objectives, Section 3.5: Analyze security exchanges
NEW QUESTION # 105
What feature of protocol analyzers shows a visual representation of who is communicating with whom, by connecting communicating nodes with a line?
Answer: D
Explanation:
A peer map in a protocol analyzer visually represents communication relationships by connecting nodes with lines, making it clear which devices are exchanging frames with each other.
NEW QUESTION # 106
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