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| Section | Objectives |
|---|---|
| RF and PHY Layer Analysis | - 802.11 PHY Standards Overview - RF Propagation and Signal Behavior - Channelization and Spectrum Usage |
| WLAN Protocol Analysis | - 802.11 Frame Structure and Fields - Frame Types and Exchanges (Management, Control, Data) - MAC Layer Operations and Behaviors |
| Spectrum Analysis and Tools | - Spectrum Analyzer Usage - Wireshark and Packet Capture Analysis - Interference Identification (Wi-Fi and Non-Wi-Fi) |
| Wireless Troubleshooting and Performance Analysis | - Identifying WLAN Performance Issues - Throughput and Latency Analysis - Common WLAN Failure Scenarios |
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72. Frage
Where, in a protocol analyzer, would you find an indication that a frame was transmitted as part of an A- MPDU?
Antwort: A
Begründung:
In a protocol analyzer, you would find an indication that a frame was transmitted as part of an A-MPDU by looking at the Aggregation flag in the Radio Tap Header. The Radio Tap Header is a pseudo-header that is added by some wireless capture devices to provide additional information about the physical layer characteristics of a frame. The Aggregation flag is one of the fields in this header, and it indicates whether the frame belongs to an A-MPDU or not. If the flag is set to 1, it means that the frame is part of an A-MPDU; if it is set to 0, it means that the frame is not part of an A-MPDU . References: CWAP-405Certified Wireless Analysis Professional Study and Reference Guide, Chapter 9: PHY Layer Frame Formats and Technologies, page 303; CWAP-405Certified Wireless Analysis Professional Study and Reference Guide, Chapter 9: PHY Layer Frame Formats and Technologies, page 304.
73. Frage
You have installed a new 802.11ac WLAN configured with 80 MHz channels. Users in one area are complaining about poor performance. This area is currently served by a single AP. You take a spectrum analysis capture in the poor performing area. While examining the waterfall plot you notice the airtime utilization is higher on the first 20 MHz of the 80 MHz channel when compared to the rest of the channel. What do you conclude?
Antwort: B
Begründung:
In 802.11ac with 80 MHz channels, the AP designates one 20 MHz subchannel as the primary channel. Management traffic and many control-related exchanges occur on the primary channel, and client contention often concentrates there. As a result, it's normal to see higher airtime utilization on the first 20 MHz segment compared to the secondary segments even when the AP is correctly operating at 80 MHz.
74. Frage
The MAC sublayer references the data unit received from the LLC sublayer as what?
Antwort: D
Begründung:
The MAC sublayer receives data from the LLC sublayer as a MAC Service Data Unit (MSDU).
The MSDU is then encapsulated into an MPDU for transmission over the wireless medium.
75. Frage
The ABC organization has recently installed an 802.11ac wave 2 network. They have seen no improvement in the WLAN performance. The network administrator has noticed that his Wi-Fi client is not using 802.11ac data rates and has asked you to troubleshoot the issue. After examining the Beacon frames from the APs, you are able to explain the problem. Which part of the beacon frame allowed you to troubleshoot this problem?
Antwort: C
Begründung:
802.11ac requires the use of AES-CCMP for encryption. If the RSN element shows TKIP, clients will not use 802.11ac rates because TKIP is incompatible with the high-throughput PHY features, explaining why no performance improvement is observed.
76. Frage
Which piece of information is not transmitted in an HT PPDU header?
Antwort: A
Begründung:
The channel number is not transmitted in an HT PPDU header. An HT PPDU header is a part of the PPDU that contains information such as modulation, coding, data rate, and number of spatial streams for an 802.11n transmission. The channel number is not included in the HT PPDU header, as it is determined by the frequency band and channel width that are used by the transmitter and receiver. The channel number can be inferred from the frequency band and channel width, which are indicated by bits in different fields of the HT PPDU header, such as HT-SIG and HT-LTF. The other options are not correct, as they are transmitted in an HT PPDU header. The number of spatial streams, PPDU length, and MCS index are indicated by bits in the HT-SIG field of the HT PPDU header. References: [Wireless Analysis Professional Study Guide CWAP-
405], Chapter 4: 802.11 Physical Layer, page 108-109
77. Frage
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