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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Spectrum Analysis | 10% | - Spectrum analysis tools - Interference detection and classification - Troubleshooting RF issues - RF spectrum fundamentals |
| Topic 2: PHY Layers and Technologies | 10% | - 802.11 physical layer standards - PHY layer troubleshooting - Modulation and coding schemes - Channelization and frequency usage |
| Topic 3: 802.11 Frame Exchanges | 30% | - Frame exchange sequences - Data transfer and protection mechanisms - Frame exchange troubleshooting - Association and authentication processes |
| Topic 4: MAC Sublayer and Functions | 25% | - MAC addressing and operations - QoS and power management - MAC frame formats and types - MAC layer troubleshooting |
| Topic 5: WLAN Medium Access | 10% | - CSMA/CA and medium access rules - Medium access related issues - Medium access performance analysis - Contention and coordination functions |
| Topic 6: Protocol Analysis | 15% | - Analysis tools and methods - Capture and decode process - Troubleshooting using protocol data - Protocol analysis fundamentals |
>> Valid CWNP CWAP-405 Exam Questions <<
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NEW QUESTION # 76
The PHY layer provides framing by adding a header to create what type of data unit?
Answer: C
Explanation:
The PHY layer provides framing by adding a header to create a PPDU. A PPDU (PHY Protocol Data Unit) is the data unit that is transmitted or received over the wireless medium by the PHY layer. A PPDU consists of a PSDU (PHY Service Data Unit) and a PHY header, which contains information such as modulation, coding, and data rate. The PHY layer adds the PHY header to the PSDU to create a PPDU for transmission, or removes the PHY header from the PPDU to extract the PSDU for reception. The other options are not correct, as they are not created by adding a header at the PHY layer. An MPDU (MAC Protocol Data Unit) is created by adding a MAC header and FCS to an MSDU (MAC Service Data Unit) at the MAC layer. An MSDU is the data unit that is passed from the LLC sublayer to the MAC sublayer or vice versa. References: [Wireless Analysis Professional Study Guide CWAP-405], Chapter 4: 802.11 Physical Layer, page 97-98
NEW QUESTION # 77
When a data frame is encrypted with WPA2, to which portion of the frame is the encryption applied?
Answer: B
Explanation:
When a data frame is encrypted with WPA2, the encryption is applied to the frame body including the LLCPDU. The LLCPDU (Logical Link Control Protocol Data Unit) is a part of the frame body that contains information such as protocol type, source and destination service access points (SAPs), and control fields. The LLCPDU is added by the LLC (Logical Link Control) sublayer to provide multiplexing and flow control functions for different upper layer protocols. When a data frame is encrypted with WPA2, which uses AES- CCMP as its encryption algorithm, both the payload and the LLCPDU are encrypted as a single unit. The MAC header and FCS are not encrypted, as they are needed for addressing and error detection purposes. References: [Wireless Analysis Professional Study Guide CWAP-405], Chapter 5: 802.11 MAC Sublayer, page 115-116
NEW QUESTION # 78
WMM-PS trigger frames can be what type of IEEE 802.11 frames? (Choose 2)
Answer: A,D
NEW QUESTION # 79
You are concerned with management overhead in your WLAN. When evaluating the network, you note that each dual-band AP provides for 4 SSIDs in each band with three secure SSIDs and one Open System SSID.
The network runs only 802.11ac APs and uses 20 MHz channels in 2.4 GHz and 400 MHz channels in 5 GHz.
What can you do to reduce the impact of beacon frames on CCI and channel utilization?
Answer: D
NEW QUESTION # 80
You have installed a new 802.1 lac 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?
Answer: D
Explanation:
The most likely cause of higher airtime utilization on the first 20 MHz of the 80 MHz channel is non-Wi-Fi interference. Non-Wi-Fi interference can prevent an AP from using its full channel width, as it will degrade the signal quality and increase the noise floor on some parts of the channel. This will force the AP to fall back to a narrower channel width, such as 20 MHz or 40 MHz, to maintain communication with its clients. The waterfall plot can help identify non-Wi-Fi interference by showing spikes or bursts of RF energy on specific frequencies or sub-channels. The other options are not correct, as they do not explain why only the first 20 MHz of the channel has higher airtime utilization. References: [Wireless Analysis Professional Study Guide], Chapter 3: Spectrum Analysis, page 74-75
NEW QUESTION # 81
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