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| Section | Objectives |
|---|---|
| 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 | - Throughput and Latency Analysis - Common WLAN Failure Scenarios - Identifying WLAN Performance Issues |
| RF and PHY Layer Analysis | - RF Propagation and Signal Behavior - Channelization and Spectrum Usage - 802.11 PHY Standards Overview |
| WLAN Protocol Analysis | - 802.11 Frame Structure and Fields - Frame Types and Exchanges (Management, Control, Data) - MAC Layer Operations and Behaviors |
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NEW QUESTION # 91
You are troubleshooting a client that is experiencing slow WLAN performance. As part of the troubleshooting activity, you start a packet capture on your laptop close to the client device. While analyzing the packets, you suspect that you have not captured all packets transmitted by the client. By analyzing the trace file, how can you confirm if you have missing packets?
Answer: C
Explanation:
One way to confirm if you have missing packets in your packet capture is to look for gaps in the sequence number in MAC headers. The sequence number is a 12-bit field in the MAC header that is used to identify and order data frames within a traffic stream. The sequence number is incremented by one for each new data frame transmitted by a STA, except for retransmissions, fragments, and control frames. The sequence number can range from 0 to 4095, and then wraps around to 0. If you see a jump or a gap in the sequence number between two consecutive data frames from the same STA, it means that you have missed some packets in between. The other options are not correct, as they do not confirm if you have missing packets in your packet capture. CRC errored packets are packets that have been corrupted during transmission and have failed the error detection check. Protocol analyzers may show the number of CRC errored packets in their statistics view, but not the number of missing packets. Retransmissions are an indication of packet loss or collision, but not necessarily of missing packets in your capture. References: [Wireless Analysis Professional Study Guide CWAP-405], Chapter 5: 802.11 MAC Sublayer, page 114-115
NEW QUESTION # 92
Which is not a valid interpretation for one of the 4 address fields in the MAC header?
Answer: D
NEW QUESTION # 93
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: A
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 # 94
You are performing a multiple adapter channel aggregation capture to troubleshoot a VoIP roaming problem and would like to measure the roaming time from the last VoIP packet sent on the old AP's channel to the first VoIP packet sent on the new AP's channel. Which timing column in the packet view would measure this for you?
Answer: A
Explanation:
The Delta time column displays the time difference between the currently displayed frame and the immediately preceding frame. By identifying the last VoIP packet on the old AP's channel and the first VoIP packet on the new AP's channel, the delta value between those two frames directly represents the roaming interruption time.
NEW QUESTION # 95
The Retry subfield is found in which IEEE 802.11 frame field?
Answer: D
NEW QUESTION # 96
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