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CWNP CWAP-405考試題庫 - CWAP-405 PDF

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>> CWNP CWAP-405考試題庫 <<

CWNP CWAP-405 PDF & 最新CWAP-405題庫資源

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最新的 CWAP Wi-Fi Analysis CWAP-405 免費考試真題 (Q104-Q109):

問題 #104
The network administrator at ABC Engineering has taken a large packet capture from one of their APs running in monitor mode. She has very little knowledge of 802.11 protocols but would like to use the capture file to evaluate the overall health and performance of their wireless network. When she asks your advice, which tool do you recommend she opens the packet capture file with?

A. Python
B. WLAN scanner
C. Spectrum analyzer
D. Capture visualization tool

答案：D

解題說明：
A capture visualization tool is a software application that can open a packet capture file and display various graphs, charts, tables, and statistics that illustrate the characteristics and behavior of the wireless network. A capture visualization tool can help a network administrator with little knowledge of 802.11 protocols to evaluate the overall health and performance of their wireless network by providing a visual and intuitive representation of the captured data. A spectrum analyzer is a hardware device that measures the radio frequency signals in a given frequency range and displays their amplitude, frequency, and modulation. A spectrum analyzer can help identify sources of interference and noise in the wireless environment, but it cannot open a packet capture file. Python is a programming language that can be used to write scripts or applications that manipulate or analyze packet capture files, but it requires coding skills and knowledge of
802.11 protocols. A WLAN scanner is a software application that scans for available wireless networks and displays information such as SSID, BSSID, channel, signal strength, security type, and vendor. A WLAN scanner can help discover wireless networks and their basic parameters, but it cannot open a packet capture file345 References:
* CWAP-405Study Guide, Chapter 2: Protocol Analysis, page 63
* CWAP-405Objectives, Section 2.5: Use capture visualization tools
* CWAP-405Study Guide, Chapter 4: Spectrum Analysis and Troubleshooting, page 117
* CWAP-405Objectives, Section 4.1: Use spectrum analysis tools
* CWAP-405Study Guide, Chapter 2: Protocol Analysis, page 33
* CWAP-405Objectives, Section 2.2: Analyze field values

問題 #105
Given: The Frame Check Sequence (FCS) is a 32 CRC used for error detection.
The CRC is calculated over what?

A. PHY Header and Mac Header only
B. PHY Header, MAC Header and Frame Body
C. Mac Header and Frame Body only
D. Frame Body only

答案：C

解題說明：
The CRC is calculated over the MAC Header and Frame Body only. The CRC (Cyclic Redundancy Check) is a 32-bit value that is used for error detection in wireless transmissions. The CRC is calculated over the MAC Header and Frame Body of a PSDU, which are the parts of the data unit that contain information such as source and destination addresses, frame type, frame control, sequence number, payload, etc. The CRC is appended to the end of the PSDU as a FCS (Frame Check Sequence) field. The CRC is not calculated over the PHY Header or PHY Preamble, which are parts of the PPDU that contain information such as modulation, coding, data rate, etc. The PHY Header and PHY Preamble are added or removed by the PHY layer during the conversion between PSDU and PPDU. References: [Wireless Analysis Professional Study Guide CWAP-
405], Chapter 4: 802.11 Physical Layer, page 97-98

問題 #106
You are troubleshooting throughput problems for a WLAN cell. The cell is provisioned with an 802.11ac dual- band AP. Users connected with both 5 GHz and 2.4 GHz connections are reporting performance problems.
The AP settings are properly optimized. No interface issues have been detected (either co-channel interference or non-Wi-Fi interference) and the number of associated users is low.
What should you analyze to resolve the issue?

A. the Ethernet uplink and the network infrastructure
B. The 5 GHz radio configuration
C. The antennas used on the client devices
D. The 2.4 GHz radio configuration

答案：A

問題 #107
How is the length of an AIFS calculated?

A. SIFS + AIFS * Time Unit
B. AIFSN * Slot Time + SIFS
C. SIFS * Slot Time + AIFSN
D. DIFS + SIFS + AIFSN

答案：B

解題說明：
The length of an AIFS (Arbitration Interframe Space) is calculated by multiplying the AIFSN (Arbitration Interframe Space Number) by the Slot Time and adding the SIFS (Short Interframe Space). An AIFS is a variable interframe space introduced by 802.11e to help prioritize medium access for different Access Categories (ACs). An AC is a logical queue that corresponds to a QoS (Quality of Service) level for different types of traffic. Each AC has a different AIFSN value, which determines how long it has to wait before attempting to access the medium. A lower AIFSN value means a higher priority and a shorter waiting time.
The Slot Time is a fixed value that depends on the PHY type and channel width. The SIFS is the shortest interframe space that is used for high-priority transmissions, such as ACKs or CTSs. The formula for calculating the AIFS length is: AIFS = AIFSN * Slot Time + SIFS. References: [Wireless Analysis Professional Study Guide CWAP-405], Chapter 7: QoS Analysis, page 194-195

問題 #108
You have been asked to recommend a solution for protocol capture of 802.11 frames consisting of 3x3:3
802.11ac communications. The requirement specifies that you gain a general view of a coverage area and does not require that you capture from specific user locations. The solution must be the least expensive practical solution possible that does not disrupt user access to the WLAN and it must be based on enterprise WLAN hardware.
What solution would you recommend so that any coverage area could be monitored on demand?

A. Install Wireshark on the Aps natively to allow dynamic capture while serving clients
B. Install laptop-based protocol analyzer near each AP
C. Install sufficient Aps so that an AP can be taken offline to perform protocol analysis as needed
D. Install the minimum number of Aps required for coverage and use these Aps for protocol analysis as needed

答案：A

問題 #109
......

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