最新CWAP-405考證 & CWAP-405測試引擎

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CWNP CWAP-405 Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: WLAN Medium Access	10%	- Medium access related issues - CSMA/CA and medium access rules - Medium access performance analysis - Contention and coordination functions
Topic 2: Protocol Analysis	15%	- Troubleshooting using protocol data - Capture and decode process - Analysis tools and methods - Protocol analysis fundamentals
Topic 3: PHY Layers and Technologies	10%	- Modulation and coding schemes - Channelization and frequency usage - PHY layer troubleshooting - 802.11 physical layer standards
Topic 4: 802.11 Frame Exchanges	30%	- Association and authentication processes - Data transfer and protection mechanisms - Frame exchange sequences - Frame exchange troubleshooting
Topic 5: MAC Sublayer and Functions	25%	- QoS and power management - MAC frame formats and types - MAC layer troubleshooting - MAC addressing and operations
Topic 6: Spectrum Analysis	10%	- Spectrum analysis tools - RF spectrum fundamentals - Interference detection and classification - Troubleshooting RF issues

>> 最新CWAP-405考證 <<

CWAP-405測試引擎 & CWAP-405软件版

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最新的 CWAP Wi-Fi Analysis CWAP-405 免費考試真題 (Q30-Q35):

問題 #30
What is an AIFS?

A. A variable Interframe Space introduced by 802.11e to help prioritize medium access for different Access Categories
B. The shortest period of time a STA can sleep
C. A form of aggregation performed at the PHY layer based on 802.11e UP values interpreted from DSCP values
D. A medium access method introduced by 802.11n, but never implemented

答案：A

解題說明：
AIFS (Arbitration Interframe Space) is a variable interframe spacing mechanism introduced by
802.11e as part of Enhanced Distributed Channel Access (EDCA). It allows different Access Categories to use different waiting times before contending for the medium, enabling prioritization of traffic such as voice and video over lower-priority data.

問題 #31
To what does the channel number displayed in the radio tap header refer?

A. Channel the frame was transmitted on
B. Channel the frame was captured on
C. The channel of the AP to which the protocol analyzer is associated
D. The channel reported in the channel field of the PHY header

答案：B

解題說明：
The channel number shown in the radio tap header reflects the channel setting of the capture adapter at the time the frame was received. It indicates where the analyzer was listening, not necessarily the channel declared in the PHY header or used by the transmitting AP.

問題 #32
ABC International has installed a new smart ZigBee controlled lighting system. However, the network team is concerned that this new system will interfere with the existing WLAN and has asked you to investigate the impact of the two systems operating simultaneously in the 2.4 GHz band. When performing Spectrum Analysis, which question could you answer by looking at the FFT plot?

A. Do the ZigBee channels used by the lighting system overlap with the WLAN channels?
B. Is the ZigBee system causing an increase in WLAN retries?
C. Is the ZigBee system using more than 50% of the available airtime?
D. Is the WLAN corrupting ZigBee system messages?

答案：A

解題說明：
The FFT plot is a spectrum analysis plot that shows the RF power present at a particular frequency over a short period of time. It can help identify the sources and characteristics of RF signals in the spectrum. By looking at the FFT plot, you can determine which ZigBee channels are used by the lighting system and whether they overlap with the WLAN channels in the 2.4 GHz band. ZigBee channels are 5 MHz wide and WLAN channels are 20 MHz or 40 MHz wide, so there is a possibility of overlap and interference between them. The other questions cannot be answered by looking at the FFT plot alone, as they require other types of plots or analysis tools, such as duty cycle plot, airtime utilization plot, or protocol analyzer. References: [Wireless Analysis Professional Study Guide], Chapter 3: Spectrum Analysis, page 69-
70

問題 #33
As a wireless network consultant you have been called in to troubleshoot a high-priority issue for one of your customers. The customer's office is based on two floors within a multi-tenant office block. On one of these floors (floor 5) users cannot connect to the wireless network. During their own testing the customer has discovered that users can connect on floor 6 but not when they move to the floor 5. This issue is affecting all users on floor 5 and having a negative effect on productivity.
To troubleshoot this issue, you perform both Spectrum and Protocol Analysis. The Spectrum Analysis shows the presence of Bluetooth signals which you have identified as coming from wireless mice. In the protocol analyzer you see the top frame on the network is Deauthentication frames. On closer investigation you see that the Deauthentication frames' source addresses match the BSSIDs of your customers APs and the destination address is FF:FF:FF:FF:FF:FF:FF.
What do you conclude from this troubleshooting exercise?

A. The CCI from the APs on the floor 4 is the problem and you need to ask the tenant below to turn down their APs Tx power
B. The customer should replace all their Bluetooth wireless mice as they are stopping the users on floor 5 from connecting to the wireless network
C. The customers APs are misbehaving and a technical support case should be open with the vendor
D. The users on floor 5 are being subjected to a denial of service attack, as this is happening across the entire floor it is likely to be a misconfigured WIPS solution belonging to the tenants on the floor below

答案：D

解題說明：
The users on floor 5 are being subjected to a denial of service attack, as this is happening across the entire floor it is likely to be a misconfigured WIPS solution belonging to the tenants on the floor below. This is because the Deauthentication frames have a source address that matches the BSSIDs of the customer's APs and a destination address that is a broadcast address (FF:FF:FF:FF:FF:FF). This indicates that someone is sending spoofed Deauthentication frames to all STAs associated with the customer's APs, causing them to disconnect from the wireless network. This is a common type of DoS attack on wireless networks, and it could be caused by a rogue device or a WIPS solution that is configured to protect the wireless network of another tenant on the floor below12. References: CWAP-405Certified Wireless Analysis Professional Study and Reference Guide, Chapter 13: Troubleshooting Common Wi-Fi Issues, page 4961; CWAP-405Certified Wireless Analysis Professional Study and Reference Guide, Chapter 14: Troubleshooting Tools, page 5272.

問題 #34
When a 5 GHz HT station in a 40 MHz BSS desires to protect a 40 MHz transmission from an OFDM station using an RTS/CTS or CTS-to-Self exchange, what frame format is used for the RTS and/or CTS frames?

A. Non-HT Duplicate
B. Dual-CTS
C. HT-mixed format
D. Phased Coexistence PPDU
E. HT-greenfield format

答案：A

問題 #35
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