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| Section | Objectives |
|---|---|
| Wireless Troubleshooting and Performance Analysis | - Identifying WLAN Performance Issues - Common WLAN Failure Scenarios - Throughput and Latency Analysis |
| Spectrum Analysis and Tools | - Interference Identification (Wi-Fi and Non-Wi-Fi) - Wireshark and Packet Capture Analysis - Spectrum Analyzer Usage |
| RF and PHY Layer Analysis | - Channelization and Spectrum Usage - RF Propagation and Signal Behavior - 802.11 PHY Standards Overview |
| WLAN Protocol Analysis | - 802.11 Frame Structure and Fields - MAC Layer Operations and Behaviors - Frame Types and Exchanges (Management, Control, Data) |
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NEW QUESTION # 16
When a data frame is encrypted with WPA2, to which portion of the frame is the encryption applied?
Answer: A
Explanation:
With WPA2 encryption, the protected portion of the frame is the frame body, which includes the LLC PDU. The MAC header remains unencrypted so that intermediate devices and receivers can process addressing and control information, while the payload (including the LLC header and upper-layer data) is encrypted to ensure confidentiality.
NEW QUESTION # 17
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?
Answer: B
Explanation:
A capture visualization tool is designed to interpret packet capture files and present the data in graphical and statistical formats that summarize network health, retry rates, throughput, channel utilization, and other performance indicators. This allows someone with limited protocol knowledge to quickly assess overall WLAN performance without needing to manually decode individual 802.11 frames.
NEW QUESTION # 18
Given: The Frame Check Sequence (FCS) is a 32 CRC used for error detection.
The CRC is calculated over what?
Answer: C
Explanation:
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
NEW QUESTION # 19
When 802.11 standard compliant AES-CCMP security is being used with IPSec/ESP for layered security, what will a WLAN protocol analyzer see as the security mechanism in use when a user browses to an HTTPS secured web page?
Answer: B
NEW QUESTION # 20
Which one of the these is the most important in the WLAN troubleshooting methodology among those listed?
Answer: C
Explanation:
Observing the problem is the most important step in the WLAN troubleshooting methodology among those listed. This step involves capturing and analyzing the relevant data from the wireless network, such as packets, frames, spectrum, and performance metrics. Observing the problem helps to verify the existence and scope of the issue, identify the root cause and possible solutions, and validate the results of any actions taken. The other steps are also important, but they are not as critical as observing the problem12 References:
* CWAP-405Study Guide, Chapter 1: Troubleshooting Methodology, page 15
* CWAP-405Objectives, Section 1.2: Observe the problem
NEW QUESTION # 21
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