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| Section | Objectives |
|---|---|
| Topic 1: Spectrum Analysis and Tools | - Spectrum Analyzer Usage - Wireshark and Packet Capture Analysis - Interference Identification (Wi-Fi and Non-Wi-Fi) |
| Topic 2: WLAN Protocol Analysis | - 802.11 Frame Structure and Fields - MAC Layer Operations and Behaviors - Frame Types and Exchanges (Management, Control, Data) |
| Topic 3: Wireless Troubleshooting and Performance Analysis | - Identifying WLAN Performance Issues - Throughput and Latency Analysis - Common WLAN Failure Scenarios |
| Topic 4: RF and PHY Layer Analysis | - RF Propagation and Signal Behavior - Channelization and Spectrum Usage - 802.11 PHY Standards Overview |
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NEW QUESTION # 20
You need to determine RF activity over time in a spectrum analyzer. It is to be able to see the activity and the amplitude of that activity.
What kind of view should be used?
Answer: A
Explanation:
The FFT shows spectral activity in the frequency domain, while waterfall or swept spectrogram views attempt to represent RF activity over time
NEW QUESTION # 21
How many frames are exchanged for 802.11 authentication in the 6 GHz band when WPA3-Enterprise is not used, and a passphrase is used instead?
Answer: A
Explanation:
Two frames are exchanged for 802.11 authentication in the 6 GHz band when WPA3-Enterprise is not used, and a passphrase is used instead. Authentication is a process that establishes an identity relationship between a STA (station) and an AP (access point) before joining a BSS (Basic Service Set). There are two types of authentication methods defined by 802.11: Open System Authentication and Shared Key Authentication.
Open System Authentication does not require any credentials or security information from a STA to join a BSS, and it consists of two frames: an Authentication Request frame sent by the STA to the AP, and an Authentication Response frame sent by the AP to the STA. Shared Key Authentication requires a shared secret key from a STA to join a BSS, and it consists of four frames: two challenge-response frames in addition to the request-response frames. However, Shared Key Authentication uses WEP (Wired Equivalent Privacy) as its encryption algorithm, which is insecure and deprecated. In the 6 GHz band, which is a newly available frequency band for WLANs, Shared Key Authentication is prohibited by the 802.11 standard, as it poses security and interference risks for other users and services in the band. The 6 GHz band requires all WLANs to use WPA3-Personal or WPA3-Enterprise encryption methods, which are more secure and robust than previous encryption methods such as WPA2 or WEP. WPA3-Personal uses a passphrase to derive a PMK (Pairwise Master Key), while WPA3-Enterprise uses an authentication server to obtain a PMK. Both methods use SAE (Simultaneous Authentication of Equals) as their authentication protocol, which replaces PSK (Pre- Shared Key) or EAP (Extensible Authentication Protocol). SAE consists of two frames: an SAE Commit frame sent by both parties to exchange elliptic curve parameters and nonces, and an SAE Confirm frame sent by both parties to verify each other's identities and generate a PMK. Therefore, when WPA3-Enterprise is not used, and a passphrase is used instead in the 6 GHz band, only two frames are exchanged for 802.11 authentication: an SAE Commit frame and an SAE Confirm frame. References: [Wireless Analysis Professional Study Guide CWAP-405], Chapter 8: Security Analysis, page 220-221
NEW QUESTION # 22
Which common feature of a Spectrum Analyzer would be the best to help you locate a non-
802.11 interference source?
Answer: B
Explanation:
A device finder feature helps physically locate the source of non-802.11 interference by providing a directional or proximity-based indication of signal strength. As you move through the environment, the tool guides you toward the strongest RF energy source, making it the most effective feature for tracking down an interfering device.
NEW QUESTION # 23
Prior to a retransmission what happens to the CWmax value?
Answer: D
Explanation:
Before a retransmission, the CWmax (Contention Window maximum) value doubles and increases by 1. The CWmax is a parameter that determines the upper limit of the random backoff time that a STA (station) has to wait before attempting to access the medium. The random backoff time is chosen from a range of values between CWmin (Contention Window minimum) and CWmax. The CWmin and CWmax values depend on the AC (Access Category) of the traffic and the PHY type of the STA. If a transmission fails due to a collision or an error, the STA has to retransmit the frame after waiting for another random backoff time. However, to reduce the probability of another collision, the STA increases its CWmax value by doubling it and adding 1.
This increases the range of possible backoff values and spreads out the STAs more evenly. The STA resets its CWmax value to its original value after a successful transmission or after reaching a predefined limit. References: [Wireless Analysis Professional Study Guide CWAP-405], Chapter 7: QoS Analysis, page
196-197
NEW QUESTION # 24
What is the difference between a Data frame and a QoS-Data frame?
Answer: D
Explanation:
QoS Data frames include an additional QoS Control field in the MAC header. This field carries traffic priority and related QoS parameters used for Enhanced Distributed Channel Access (EDCA), enabling differentiated handling of traffic categories such as voice, video, best effort, and background.
NEW QUESTION # 25
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